irrational.adjective
not having commonsense.reasoning; marked by a lack of mental accord and sound judgment; not crazy, just close to it, being unsane
irrationally.adverb
irrationality.noun,.plural.irrationalities
the state or quality of being irrational; an irrational idea, such as doing in a different way something having no more benefits than that which already has been done simply and properly
irrationalness.noun,.plural.irrationalnesses
irrationalism.noun,.plural.irrationalisms
irrationality; irrational thought, expression or behavior, such as the not too bright ancient Balaam showed:.Numbers 22:1-4; 
the state or quality of being.irrational; an irrational idea, expression or act
irrationalism.noun
irrational thought, expression or behavior; irrationality; belief in feeling, instinct or other non rational forces rather than reason

irrational number.noun,.plural.irrational numbers
any real number that cannot be expressed as an integer or as a ratio between two integers

imaginary number.noun,.plural.imaginary numbers
a complex number in which the real part is zero and the coefficient of the imaginary unit is not zero

imperious.adjective
arrogantly.domineering or overbearing
imperiously.adverb
imperiousness.noun,.plural.imperiousnesses
synonyms.dictatorial, authoritarian, dogmatic, overbearing

incandescent.adjective
emitting visible light as a result of being heated; shining brilliantly; very bright; characterized by ardent emotion, intensity or brilliance
incandescence.noun,.plural.incandescences
the emission of visible light by a hot object such as an incandescent light bulb; the light emitted by an incandescent object, such as the much healthier older yellow light bulbs we all used; a blaze (the incandescence of a beautiful outdoor warming fire); an incandescencent light comes from something that is heated until it glows, such as the filament in incandescent light bulbs
incandescently.adverb

indifferent.adjective
not mattering one way or the other; having no marked feeling for or against; not active or involved; having no particular interest in or concern for; apathetic (indifferent to the snide remarks of others); being neither too much nor too little; moderate; being neither good nor bad; mediocre (an indifferent performance); being neither right nor wrong; neutral (an indifferent response to the question); characterized by a lack of partiality; unbiased (a properly indifferent jury); undifferentiated
indifferently.adverb
synonyms.unconcerned, incurious, detached, uninterested; nonchalant
indifference.noun,.plural.indifferences
the state or quality of being indifferent

infrared.adjective
of or relating to the range of invisible radiation wavelengths from about 750 nanometers, just longer than red in the visible spectrum, to 1 millimeter, on the border of the microwave region
infrared.noun,.plural.infrareds
infrared light or the infrared part of the spectrum

irony.noun,.plural.ironies
if you talk about the irony of a situation, you mean that it is odd or amusing because it involves a contrast between apparent and intended.meaning; incongruity between what might be expected and what actually occurs (the irony is that many who are in government agree in private that their policies are inconsistent with laws set down for the benefit of We The People); the use of words to express something different from and often opposite to their literal meaning; an expression or utterance.marked by a deliberate.contrast (much humor relies on irony to make you laugh)
ironic.also.ironical.adjective
characterized by or constituting irony; given to the use of irony; poignantly contrary to what was expected or intended (the irony of life is going through it without the true God)
ironically.adverb
ironicalness.noun.(words ending in 'ess' are usually without pluralization - adding an 'es' making '...esses' is clumsy)
synonyms-sarcastic, caustic, satirical, sardonic

irreligious.adjective
hostile or indifferent to religion; unGodly; an irreligious person does not accept the beliefs of any religion or opposes all religions
irreligiously.adverb
irreligiousness.noun.(words ending in 'ess' are usually without pluralization - adding an 'es' making '...esses' is clumsy)

inerrant.adjective
incapable of erring; infallible; containing no errors

infallible.adjective
incapable of erring; incapable of failing; certain (an infallible Creator)
infallibly.adverb
infallibility.noun,.plural.infallibilities
infallibleness.noun,.plural.infalliblenesses

icon.also.ikon.noun,.plural.icons also ikons
an image; a representation; a simile or symbol (a smile is a symbol of a happy heart); a representation or picture of a sacred or sanctified personage (a picture of Emmanuel; a statue of Budda); something or someone who is the object of great attention and devotion; an idol
Computers:.a picture on a screen that when clicked on executes a specific command according to the computer's programming (click on the pic of the download arrow to download)

iconoclast.noun,.plural.iconoclasts
one who attacks and seeks to overthrow traditional or popular ideas or institutions
iconoclastically.adverb
iconoclastic.adjective

ionosphere.noun
a region of the Earth's atmosphere where ionization caused by incoming solar radiation affects the transmission of radio waves; it extends from a height of 50 kilometers (30 miles) to 400 kilometers (250 miles) above the surface of the Earth
ionospheric.adjective

invective.noun,.plural.invectives
invective is rude and unpleasant things that people shout at people they hate or are angry with (racist books filled with invectives); denunciatory or abusive language; vituperation; denunciatory or abusive expression or discourse
invective.adjective
of, relating to or characterized by denunciatory or abusive language
invectively.adverb
invectiveness.noun,.plural.invectivenesses

icosahedron.noun,.plural.icosahedrons or icosahedra
a polyhedron having 20 faces
icosahedral.adjective

inanimate.adjective
not having the qualities.associated with connection to the invisible, intelligent energy field out of which everything emerges; not animate
Grammar:.belonging to the class of nouns that stand for nonliving things (the word car is inanimate; the word dog is animate)
inanimately.adverb
inanimateness.noun,.plural.inanimatenesses
synonym.dead

implore, implored, imploring, implores.transitive verbs
to ask with tears; to appeal to in supplication; beseech.(implored the tribunal to have mercy; to urgently beg for; entreat
intransitive verb use.to make an earnest appeal
imploration.noun,.plural.implorations
implorer.noun,.plural.implorers
imploringly.adverb

inveterate.adjective
firmly and long established; deep rooted (inveterate preferences and beliefs); persisting in an ingrained.habit; habitual (an inveterate liar); chronic
inveteracy.noun,.plural.inveteracies
inveterateness.noun,.plural.inveteratenesses
inveterately.adverb

irascible.adjective
prone to outbursts of temper; easily angered; characterized by or resulting from anger
irascibly.adverb
irascibility.noun,.plural.irascibilities
irascibleness.noun,.plural.irasciblenesses

indicative.adjective
serving to indicate.(rainbows indicative of good weather); an insignia indicative of high rank; if one thing is indicative of another, it suggests or indicates what the other thing is likely to be
indicative.noun,.plural.indicatives
indicatively.adverb
Grammar:.the indicative mood; a clause that is in the indicative also called the indicative mood, has a subject followed by a verb group, examples are ('I'm hungry' and 'she was followed'); clauses of this kind are typically used to make statements

inscribe, inscribed, inscribing, inscribes.transitive verbs
to write, print, carve or engrave words or letters on or in a surface; to mark or engrave a surface with words or letters; to enter a name on a list or in a register; to sign one's name or write a brief message in or on a gift book or photograph, for example; to dedicate to someone
Mathematics:.to draw one figure within another figure so that every vertex of the enclosed figure touches the outer figure
inscriber.noun,.plural.inscribers
inscription.noun,.plural.inscriptions
the act or an instance of inscribing; something, such as the wording on a coin, medal, monument or seal, that is inscribed; a short, signed message in a book or on a photograph given as a gift (the ancient Egyptian inscriptions; the inscriptions of the Assyrian king Sargon)
inscriptive.or.inscriptional.adjective
inscriptively.adverb

impair, impaired, impairing, impairs.transitive verbs
to cause to diminish, as in strength, value or quality (he bruised his arm imparing use of the hammer he used in his work; a severe storm impaired communications); injure
impairment.noun,.plural.impairments

indivisible.adjective
incapable of undergoing division (an indivisible union)
Mathematics:.incapable of being divided without a remainder (the number 15 is indivisible by 7)
indivisibleness.noun,.plural.indivisiblenesses
indivisibility.noun,.plural.indivisibilities
indivisibly.adverb

impassive.adjective
devoid of or not subject to emotion; revealing no emotion; expressionless; incapable of physical sensation; motionless; still
impassively.adverb
impassiveness.(words ending in 'ess' are usually without pluralization - adding an 'es' making '...esses' is clumsy)
impassivity.noun,.plural.impassivities

idle, idler, idlest.adjective
inactive; if people who were working are idle, they have no jobs or work (employees have been idle almost a month because of shortages of supply); not employed or busy; if machines or factories are idle, they are not working or being used (now the machine is lying idle); if you say that someone is idle, you disapprove of them because they are not doing anything and you think they should be; not in use or operation (idle hands); lazy; lacking.substance, value or basis; idle is used to describe something that you do for no particular reason, often because you have nothing better to do (Brian kept up the idle chatter for another five minutes; we were not idly sitting around); not employed or busy (idle carpenters); inactive; to do nothing; not in use or operation (of all the tired kids he was the idlest of them all)
idle, idled, idling, idles.verbs
intransitive verb use.to pass time without working or while avoiding work; to run a motor vehicle or device at a slow speed or out of gear
transitive verb use.to pass time without working (relaxed and idled the afternoon away in the Sun); waste; to cause a motor, for example to idle (he forgot he left the engine running so the car idled for a long time)
idleness.noun,.plural.idlenesses
idler.noun,.plural.idlers

idly.adverb
she sat idly by just soaking up the Sun
idyl.noun.also spelt.idyll,.plural.idyls,.idylls
if you describe a situation as an idyll, you mean that it is idyllic (she finds that the sleepy town she moves to isn't the rural idyll she imagined); a short poem or prose piece depicting a rural or pastoral scene, usually in idealized.terms; a narrative poem treating an epic or romantic theme; a scene or an event of a simple and tranquil nature; a carefree episode or experience (a summer being idyll on the coast of British Columbia); a romantic.interlude
idyllically.adverb
idyllic.adjective
of or having the nature of an idyl; simple and carefree (an idyllic vacation in a seashore cottage)

introduction.noun,.plural.introductions
the act or process of introducing or the state of being introduced; a means, such as a personal letter, of presenting one indifidual to another; something recently introduced; an innovation; a preface, as to a book; an introduction for a speech; in music, a short preliminary movement in a larger work; a basic introductory text or course of study
introductory.adjective
of, relating to or constituting an introduction; serving to introduce; preliminary
introductorily.adverb
introduce, introduced, introducing, introduces.transitive verbs
to acquaint someone by name for the first time to others (if introducing someone to another that you have already been introduced to, you say 'may I present 'full name', such as Sally Jones, to you', as this lets the people know that you already know this person which is being introduced to them); to bring forward a plan, for example for consideration; to provide someone with a beginning knowledge or first experience of something (introduced me to yoga); to bring in and establish in a new place or environment (exotic plants that had been introduced from the jungle); to bring into use or practice; originate (introduced the new product in several test markets; introduced the tango into their circle of friends); to open or begin; preface (introduced the movie with an orienting talk)
introducible.adjective
introducer.noun,.plural.introducers

inaudible.adjective
impossible to hear (an inaudible conversation); not audible
inaudibly.adverb
inaudibility.noun,.plural.inaudibilities