unwavering, a. steadfast, resolute.

unwearied, a. indefatigable.

unweighable, a. imponderable.

unwholesome, a. baneful, insalubrious.  See unhealthy.

unwieldy, a. ponderous, cumbersome, clumsy.

unwilling, a. reluctant, indisposed, loath, disinclined, averse.

unwind v. disentangle, unravel.

unwise, a. imprudent, injudicious, inexpedient, indiscreet.

unwittingly, adv. unknowingly, undesignedly, inadvertently.

unworthy, a. unmeritorious, undeserving, despicable, contemptible.

unwritten, a. traditional.

unyielding, a. inflexible, stiff, unbending, incompliant, indomitable, insubmissive, tenacious, unimpressible, impliable, obdurate, intractable, game, resolute.

upbraid, v. reproach, scold, chide, rate, reprove, reprimand, twit.

upbraiding, n. scolding, reproach, reprimand, censure, reprehension.

up grade. ascent, acclivity.

uphill, a. ascending, acclivous, rising.

uphold, v. support, sustain, vindicate, defend.

upkeep, n. maintenance.

upper, n. vamp (of a shoe).

upper-hand, n. advantage, mastery, dominion, control.

upper ten. (Colloq.) aristocracy, elite, bon ton.

uppish, a. (Colloq.) proud, arrogant, assuming.

upright, a. erect, perpendicular, vertical; honorable, honest.

uprightness, n. perpendicularity, verticality, erectness; honesty, integrity.

uproar, n. turmoil, fracas, clamor, tumult, commotion, din, hubbub.

uproarious, a. (Colloq.) clamorous, obstreperous, boisterous, noisy, turbulent.

uproot, v. eradicate, extirpate.

uprooting, n. eradication, extirpation.

upset, v. overturn, overset, capsize, invert, overthrow; disconcert, discompose, perturb, agitate, unnerve, excite.

upshot, n. event, result, issue, outcome, consequence.

upside down. inverted; disordered, topsy-turvy.

upstart, n. parvenu, snob, mushroom.

up to snuff. (Slang) knowing, acute, sharp.

upward, a. ascending, acclivous (sloping upward).

urge, v. egg, importune, exhort; impel, force; incite, instigate, goad.

urgency, n. insistence, pressure; importunity; exigency, stress, necessity; incitement.

urgent, a. pressing, imperative, insistent, exigent, importunate, pertinacious, imperious.

urine, n. piss, emiction; stale (urine of horses and cattle).  Associated words:  uronology, urinal, urinate, urination, micturition, urethra, uric, uretic, uriniferous, enuresis, anuresis, diabetis, strangury, urolith, lateritious sediment, uroscopy, urinary, urea, diuretic.

usage, n. treatment; custom, practice, use.

use, n. employment, application, service, utilization, exploitation; necessity, need; utility, avail, advantage, usefulness, service; custom, usage, practice.  Antonyms:  disuse, obsolescence, desuetude, inutility.  Associated Words:  obsolescent, obsolete, obsoletism, utilitarian, utilitarianism, utilizable, chrestomathic.