unmalleable.adjective
difficult or hard to shape or work (the play dough was so dry it was unmalleable); unable to yield to new ideas or consider.alternate ones; not malleable

unappealing.adjective
not appealing to the senses, as in appearance, emotion, taste or aroma
unappealingly.adverb

untidy, untidier, untidiest.adjectives
not neat and tidy; sloppy; slovenly; disorderly and disorganized (untidy bedroom or kitchen)
untidily.adverb
untidiness.noun,.plural.untidinesses

unbearable.adjective
so unpleasant, distasteful or painful as to be intolerable (unbearable heat)
unbearably.adverb
unbearableness.noun.(most words ending in 'ess' are usually without pluralization - adding an 'es' making '...esses' is clumsy)

unattended.adjective
not being attended to, looked after or watched (an unattended patient waiting to be seen); having no attendants (unattended gasoline pumps); not being paid attention to or listened to (children's unattended questions are common in dumb ass schools)

unfriendly, unfriendlier, unfriendliest.adjectives
not disposed to friendship; indicating a bad prospect; unfavorableness (unfriendly clouds)
unfriendliness.noun.(words ending in 'ess' are usually without pluralization - adding an 'es' making '...esses' is clumsy)

unadmonished, unchastened, unrebuked, unrebukeable, unreproved, unreprovable.adjectives
these adjectives mean all the same thing; not subjected to reproof or rebuke; not able to be rebuked for a fault or misdeed

unprocessed.adjective
not having been processed or refined (unrefined ore; crude oil); not altered from an original or natural.state; not treated or prepared by any special process

uncorrupted.adjective
not having its purity or excellence.debased; undefiled; not decayed or decomposed; unspoiled (a few were dishonest but he remained uncorrupted); uncorrupted values; see also incorrupt

unblemished.adjective
lacking.blemishes or faults (an unblemished orange); an unblemished record of service to those electing him)

unchecked.adjective
not held in check; unrestrained (an unchecked flow of water; an unchecked temper); not checked for accuracy, efficiency or flaws (an unchecked list)

unrest.noun,.plural.unrests
an uneasy or troubled condition (he was in a state of unrest when he lost his wallet while traveling overseas far from home)

untimely, untimelier, untimeliest.adjectives
occurring or done at an inappropriate time; inopportune; occurring too soon; premature (an untimely visit)
untimely.adverb
inopportunely; prematurely
untimeliness.noun.(normally used without being pluralized)

uncommon, uncommoner, uncommonest.adjectives
not common; rare; remarkable
uncommonly.adverb
uncommonness.noun.(normally used without being pluralized)

undefiled.adjective
clean and pure.spiritually; not defiled

underrate, underrated, underrating, underrates.transitive verbs
to rate.too low; underestimate

underestimate, underestimated, underestimating, underestimates.transitive verbs
to make too low an estimate of the quantity, degree or worth of (he underestimated the amount needed and had to get some more)
underestimate.noun,.plural.underestimates
an estimate that is or proves to be too low (once the auto body shop began working on the damage to the vehicle, they could see they had underestimated the cost of repairing)
underestimation.noun,.plural.underestimations

unparalleled.adjective
without parallel, equal or match; unequaled

unequaled.adjective
not matched or paralleled by others of its kind; not equal; unrivaled
unequal.adjective
not the same in any measurable aspect, such as extent or quantity; not the same as another in rank or social.position; having unbalanced sides or parts; asymmetrical; not even or consistent; variable
unequal.noun,.plural.unequals
one that is not the equal of another
unequally.adverb

unbalanced.adjective
not in balance or in proper balance; mentally.deranged (how to know); not exhibiting.sound.judgment; irrational; in accounting, not satisfactorily.adjusted so that debit and credit.correspond
unbalance, unbalanced, unbalancing, unbalances.transitive verbs
to upset the balance, stability or equilibrium of
unbalance.noun,.plural.unbalances
the condition of being unbalanced
unbalanceable.adjective
not able to be balanced (as much as we tried, the machine just would not run smoothly so we labeled it as being unbalanceable)

unusable.adjective
something that is unusable is not in a good enough state or condition to be used (the rickety road was near being unusable)

unfasten, unfastened, unfastening, unfastens.verbs
transitive verb use.to separate the connected.parts of
intransitive verb use.to become loosened or separated

uninvolved.adjective
feeling or showing no interest or involvement; unconcerned (she wasn't concerned with the gossip she had been hearing as she knew the truth of what was being said)

unsegmented.adjective
having a body that is not divided into segments (unsegmented worms)

unreverberant.adjective
not reverberant; lacking a tendency to reverberate; nonresonant

unmannerly.adjective
ill mannered; rude
unmannerly.adverb
unmannerliness.noun,.plural.unmannerlinesses

upgrade, upgraded, upgrading, upgrades.verbs
transitive verb use.to raise to a higher grade or standard (upgrading rural roads); to improve the qualityor condition of (the sound quality in new laptops is a big step over the older ones)
intransitive verb use.to exchange a possession for one of greater value or quality (traded up to a new model)
upgrade.noun,.plural.upgrades
the act or instance of upgrading; something that upgrades (this is an upgraded chip for your computer); an upward incline
upgrade.adjective
uphill
on the upgrade.idiom
improving or progressing: on the mend

unimpeachable.adjective
difficult or impossible to impeach (an unimpeachable witness); beyond.reproach; blameless (unimpeachable behavior); beyond doubt; unquestionable
unimpeachably.adjective

unbelievable.adjective
not to be believed; incredible (unbelievable singing voice for such a young age)
unbelievably.adverb
unbelieving.adjective
not believing; doubting
unbelievingly.adverb
unbelievingness.noun,.plural.unbelievingnesses
unbelief.noun
lack of belief or faith (a person with unbelief in something is either mentally lazy to the point of being unwilling to research to find answers or there is just not enough information to provide a basis for belief)
unbeliever.noun,.plural.unbelievers
one who lacks belief or faith; a nonbeliever