U

ubiquitous adj. Being present everywhere.
ulterior adj. Not so pertinent as something else to the matter spoken of.
ultimate adj. Beyond which there is nothing else.
ultimatum n. A final statement or proposal, as concerning terms or conditions.
ultramundane adj. Pertaining to supernatural things or to another life.
ultramontane adj. Beyond the mountains, especially beyond the Alps (that is, on their Italian side).
umbrage n. A sense of injury.
unaccountable adj. Inexplicable.
unaffected adj. Sincere.
unanimous adj. Sharing the same views or sentiments.
unanimity n. The state or quality of being of one mind.
unavoidable adj. Inevitable.
unbearable adj. Unendurable.
unbecoming adj. Unsuited to the wearer, place, or surroundings.
unbelief n. Doubt.
unbiased adj. Impartial, as judgment.
unbridled adj. Being without restraint.
uncommon adj. Rare.
unconscionable adj. Ridiculously or unjustly excessive.
unconscious adj. Not cognizant of objects, actions, etc.
unction n. The art of anointing as with oil.
unctuous adj. Oily.
undeceive v. To free from deception, as by apprising of the real state of affairs.
undercharge v. To make an inadequate charge for.
underexposed adj. Insufficiently exposed for proper or full development, as negatives in photography.
undergarment n. A garment to be worn under the ordinary outer garments.
underman v. To equip with less than the full complement of men.
undersell v. To sell at a lower price than.
undersized adj. Of less than the customary size.
underhanded adj. Clandestinely carried on.
underlie v. To be the ground or support of.
underling n. A subordinate.
undermine v. To subvert in an underhand way.
underrate v. To undervalue.
understate v. To fail to put strongly enough, as a case.
undervalue v. To underestimate.
underworld n. Hades.
underwrite v. To issue or be party to the issue of a policy of insurance.
undue adj. More than sufficient.
undulate v. To move like a wave or in waves.
undulous adj. Resembling waves.
unfavorable adj. Adverse.
ungainly adj. Clumsy.
unguent n. Any ointment or lubricant for local application.
unicellular adj. Consisting of a single cell.
univalence n. Monovalency.
unify v. To cause to be one.
unique adj. Being the only one of its kind.
unison n. A condition of perfect agreement and accord.
unisonant adj. Being in a condition of perfect agreement and accord.
Unitarian adj. Pertaining to a religious body that rejects the doctrine of the Trinity.
unlawful adj. Illegal.
unlimited adj. Unconstrained.
unnatural adj. Artificial.
unnecessary adj. Not essential under the circumstances.
unsettle v. To put into confusion.
unsophisticated adj. Showing inexperience.
unspeakable adj. Abominable.
untimely adj. Unseasonable.
untoward adj. Causing annoyance or hindrance.
unutterable adj. Inexpressible.
unwieldy adj. Moved or managed with difficulty, as from great size or awkward shape.
unwise adj. Foolish.
unyoke v. To separate.
up-keep n. Maintenance.
upbraid v. To reproach as deserving blame.
upcast n. A throwing upward.
upheaval n. Overthrow or violent disturbance of established order or condition.
upheave v. To raise or lift with effort.
uppermost adj. First in order of precedence.
uproarious adj. Noisy.
uproot v. To eradicate.
upturn v. To throw into confusion.
urban adj. Of, or pertaining to, or like a city.
urbanity n. Refined or elegant courtesy.
urchin n. A roguish, mischievous boy.
urgency n. The pressure of necessity.
usage n. Treatment.
usurious adj. Taking unlawful or exorbitant interest on money loaned.
usurp v. To take possession of by force.
usury n. The demanding for the use of money as a loan, a rate of interest beyond what is allowed by law.
utilitarianism n. The ethical doctrine that actions are right because they are useful or of beneficial tendency.
utility n. Fitness for some desirable practical purpose.
utmost n. The greatest possible extent.