| u | (adjective) (chiefly British) of or appropriate to the upper classes especially in language use | - |
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| ubiquitous | (adjective) being present everywhere at once | Synonyms: omnipresent |
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| ugly | (adjective) displeasing to the senses | - |
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| (adjective) morally reprehensible | Synonyms: despicable, slimy, unworthy, vile, worthless, wretched |
| (adjective) inclined to anger or bad feelings with overtones of menace | Synonyms: surly |
| (adjective) provoking horror | Synonyms: atrocious, frightful, horrible, horrifying |
| ulcerated | (adjective) having an ulcer or canker | Synonyms: cankerous, ulcerous |
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| ulcerative | (adjective) of or relating to or characterized by ulceration | - |
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| ulcerous | (adjective) having an ulcer or canker | Synonyms: cankerous, ulcerated |
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| ulnar | (adjective) relating to or near the ulna | - |
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| ult | (adjective) in or of the month preceding the present one | Synonyms: ultimo |
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| ulterior | (adjective) lying beyond what is openly revealed or avowed (especially being kept in the background or deliberately concealed) | Synonyms: subterranean, subterraneous |
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| (adjective) beyond or outside an area of immediate interest; remote | - |
| (adjective) coming at a subsequent time or stage | Synonyms: later, posterior |
| ultimate | (adjective) furthest or highest in degree or order; utmost or extreme | - |
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| (adjective) being the last or concluding element of a series | - |
| ultimo | (adjective) in or of the month preceding the present one | Synonyms: ult |
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| ultra | (adjective) (used of opinions and actions) far beyond the norm | Synonyms: extremist, radical |
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| ultraconservative | (adjective) extremely conservative | - |
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| ultramarine | (adjective) of a brilliant pure blue to purplish blue color | - |
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| ultramicroscopic | (adjective) too small to be seen without an ultramicroscope | - |
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| ultramodern | (adjective) extremely modern | - |
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| ultramontane | (adjective) of or relating to ultramontanism | - |
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| (adjective) on the Italian or Roman side of the Alps | Synonyms: cisalpine |
| (adjective) on or relating to or characteristic of the region or peoples beyond the Alps from Italy (or north of the Alps) | Synonyms: transalpine |
| ultranationalistic | (adjective) fanatically patriotic | Synonyms: chauvinistic, flag-waving, jingoistic, nationalistic, superpatriotic |
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| ultrasonic | (adjective) having frequencies above those of audible sound | Synonyms: supersonic |
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| ultraviolet | (adjective) having or employing wavelengths shorter than light but longer than X-rays; lying outside the visible spectrum at its violet end | - |
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| umbellar | (adjective) bearing or consisting of or resembling umbels | Synonyms: umbellate |
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| umbellate | (adjective) bearing or consisting of or resembling umbels | Synonyms: umbellar |
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| (adjective) resembling an umbel in form | Synonyms: umbel-like |
| umbelliferous | (adjective) relating to or belonging to plants of the family Umbelliferae | - |
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| umbelliform | (adjective) resembling or in the form of an umbel | - |
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| umber | (adjective) of the color of any of various natural brown earth pigments | - |
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| umbilical | (adjective) relating to or resembling the umbilicus | - |
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| umbilicate | (adjective) depressed like a navel | - |
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| umbrageous | (adjective) angered at something unjust or wrong | Synonyms: incensed, indignant, outraged |
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| (adjective) filled with shade | Synonyms: shadowed, shadowy, shady |
| umbrella | (adjective) covering or applying simultaneously to a number of similar items or elements or groups | - |
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| umbrellalike | (adjective) resembling an umbrella | - |
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| umpteen | (adjective) innumerable but many | Synonyms: umteen |
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| umpteenth | (adjective) last in an indefinitely numerous series | Synonyms: umptieth, umteenth |
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| umptieth | (adjective) last in an indefinitely numerous series | Synonyms: umpteenth, umteenth |
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| umteen | (adjective) innumerable but many | Synonyms: umpteen |
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| umteenth | (adjective) last in an indefinitely numerous series | Synonyms: umpteenth, umptieth |
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| unabashed | (adjective) not embarrassed | Synonyms: unembarrassed |
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| unabated | (adjective) continuing at full strength or intensity | - |
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| unable | (adjective) (usually followed by `to') not having the necessary means or skill or know-how | - |
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| (adjective) lacking in power or forcefulness | Synonyms: ineffective, ineffectual |
| (adjective) (usually followed by `to') lacking necessary physical or mental ability | - |
| unabridged | (adjective) (used of texts) not shortened | - |
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| unabused | (adjective) not physically abused; treated properly | - |
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| unaccented | (adjective) (used of syllables) carrying no stress | Synonyms: atonic |
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| (adjective) (used of vowels or syllables) pronounced with little or no stress | Synonyms: light, weak |
| unacceptable | (adjective) not acceptable; not welcome | - |
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| (adjective) (used of persons or their behavior) not acceptable or reasonable | Synonyms: impossible |
| (adjective) not conforming to standard usage | Synonyms: unaccepted |
| (adjective) not adequate to give satisfaction | - |
| unaccepted | (adjective) not conforming to standard usage | Synonyms: unacceptable |
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| unaccessible | (adjective) capable of being reached only with great difficulty or not at all | Synonyms: inaccessible |
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| unaccommodating | (adjective) not accommodating | Synonyms: unobliging |
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| (adjective) offering no assistance | - |
| unaccompanied | (adjective) being without an escort | - |
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| (adjective) playing or singing without accompaniment | - |
| (adjective) (of a state or an event) taking place without something specified occurring at the same time | - |
| unaccountable | (adjective) not to be accounted for or explained | Synonyms: unexplainable |
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| (adjective) free from control or responsibility | - |
| unaccredited | (adjective) lacking official approval | Synonyms: unlicenced, unlicensed |
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| unaccustomed | (adjective) unusual or unfamiliar | - |
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| unachievable | (adjective) impossible to achieve | Synonyms: unattainable, undoable, unrealizable |
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| unacknowledged | (adjective) not recognized or admitted | - |
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| (adjective) not openly acknowledged | - |
| unacquainted | (adjective) having little or no knowledge of | Synonyms: unacquainted with, unfamiliar with |
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| (adjective) not knowledgeable about something specified | Synonyms: innocent |
| unacquisitive | (adjective) not acquisitive; not interested in acquiring or owning anything | - |
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| unactable | (adjective) not actable | - |
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| unadaptable | (adjective) not adaptable | - |
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| unadapted | (adjective) not having adapted to new conditions | Synonyms: unadjusted |
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| (adjective) not changed in form or character for a purpose | - |
| unaddicted | (adjective) not addicted | - |
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| unaddressed | (adjective) not addressed | - |
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| unadjustable | (adjective) not adjustable | - |
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| unadjusted | (adjective) not altered to fit certain requirements | - |
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| (adjective) not having adapted to new conditions | Synonyms: unadapted |
| unadoptable | (adjective) difficult to place in an adoptive home | - |
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| unadorned | (adjective) not decorated with something to increase its beauty or distinction | Synonyms: undecorated |
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| unadulterated | (adjective) not mixed with impurities | - |
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| (adjective) without qualification; used informally as (often pejorative) intensifiers | Synonyms: arrant, complete, consummate, double-dyed, everlasting, gross, perfect, pure, sodding, staring, stark, thorough, thoroughgoing, utter |
| unadventurous | (adjective) lacking in boldness | - |
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| unadvisable | (adjective) not prudent or wise; not recommended | Synonyms: inadvisable |
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| unadvised | (adjective) without careful prior deliberation or counsel | Synonyms: ill-advised |
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| (adjective) having received no information | - |
| unaerated | (adjective) (used of blood) not supplied with oxygen | Synonyms: unoxygenated |
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| unaesthetic | (adjective) violating aesthetic canons or requirements; deficient in tastefulness or beauty | Synonyms: inaesthetic |
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| unaffected | (adjective) undergoing no change when acted upon | - |
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| (adjective) free of artificiality; sincere and genuine | - |
| (adjective) emotionally unmoved | Synonyms: unmoved, untouched |
| (adjective) unaware of or indifferent to | Synonyms: insensible |
| unaffecting | (adjective) not arousing affect | - |
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| unaffectionate | (adjective) lacking affection or warm feeling | Synonyms: detached, uncaring |
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| unaffiliated | (adjective) not affiliated | - |
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| unaffixed | (adjective) not affixed | Synonyms: loose |
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| unafraid | (adjective) oblivious of dangers or perils or calmly resolute in facing them | Synonyms: fearless |
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| (adjective) free from fear or doubt; easy in mind | Synonyms: secure, untroubled |
| unaged | (adjective) not subjected to an aging process | - |
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| unaggressive | (adjective) not aggressive; not given to fighting or assertiveness | Synonyms: nonaggressive |
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| unagitated | (adjective) not agitated or disturbed emotionally | - |
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| (adjective) not physically disturbed or set in motion | - |
| (adjective) not agitated; without losing self-possession | Synonyms: calm, serene, tranquil |
| unaided | (adjective) carried out without aid or assistance | - |
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| unaired | (adjective) lacking fresh air | Synonyms: airless, close, stuffy |
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| unairworthy | (adjective) not fit to fly | - |
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| unalarming | (adjective) not alarming; assuaging alarm | - |
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| unalert | (adjective) not alert to what is potentially dangerous | Synonyms: unvigilant, unwatchful |
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| unalienable | (adjective) incapable of being repudiated or transferred to another | Synonyms: inalienable |
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| unalike | (adjective) not alike or similar | Synonyms: dissimilar |
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| unalloyed | (adjective) free from admixture | - |
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| unalterable | (adjective) not capable of being changed or altered | Synonyms: inalterable |
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| (adjective) of a sentence; that cannot be changed | - |
| (adjective) remaining the same for indefinitely long times | Synonyms: changeless |
| unaltered | (adjective) remaining in an original state | Synonyms: unchanged |
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| unambiguous | (adjective) having or exhibiting a single clearly defined meaning | - |
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| (adjective) admitting of no doubt or misunderstanding; having only one meaning or interpretation and leading to only one conclusion | Synonyms: unequivocal, univocal |
| unambitious | (adjective) having little desire for success or achievement | Synonyms: ambitionless |
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| unamended | (adjective) (of legislation) not amended | - |
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| unanalyzable | (adjective) representing the furthest possible extent of analysis or division into parts | Synonyms: undecomposable |
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| unanalyzed | (adjective) not analyzed or broken down for detailed examination | - |
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| unangry | (adjective) not angry | - |
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| unanimated | (adjective) not animated or enlivened; dull | - |
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| unanimous | (adjective) in complete agreement | Synonyms: consentaneous, consentient |
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| (adjective) acting together as a single undiversified whole | Synonyms: solid, whole |
| unannealed | (adjective) (of metal or glass) not annealed and consequently easily cracked or fractured | Synonyms: brittle |
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| unannounced | (adjective) without warning or announcement | Synonyms: unheralded, unpredicted |
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| unanswerable | (adjective) impossible to answer | - |
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| unanswered | (adjective) not returned in kind | Synonyms: unreciprocated, unrequited |
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| unanticipated | (adjective) not anticipated | Synonyms: out of the blue, unforeseen, unlooked-for, unseen |
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