Letter: u
- ultra-high frequency, RF, UHF, VHF, audio frequency, cycle, frequency, kilocycle, megacycles, spectrum
- ultra-ultra, a la mode, advanced, contemporary, extreme, far out, fashionable, furthest, greatest, in, mod, modern, modernized, modish, most, now
- ultraconservative, Tory, anarchistic, backward, conservationist, conservative, die-hard, extreme, extreme right-winger, extremist, fogy, fogyish, hard hat, imperialist, mildly radical, monarchist
- ultracritical, captious, hair-splitting, hypercritical, hypersensitive, over-sensitive, overconscientious, overcritical, quibbling
- ultramarine, blue, colour, overseas, pigment
- ultramodern, a la mode, advanced, avant-garde, contemporary, far out, fashionable, forward-looking, in, mod, modern, modernistic, modernized, modish, now, present-day
- ultramontane, alien, barbarian, canonical, churchly, clerical, displaced person, ecclesiastical, episcopal, evangelistic, exile, foreigner, gringo, ministerial, outlander, outlaw
- ultrasonics, sound barrier, speed of sound, supersonics
- ultrasound, amplitude, loudness, noise, phone, sound wave
- ultraviolet heat, burning, fever, heating, superheat, warmth
- ultraviolet ray, X ray, actinic ray, atomic beam, atomic ray, beam, beam of light, gamma ray, gleam, infra-red ray, invisible radiation, patch, pencil, photon, radiation, ray
- ululate, bark, bawl, bay, bell, bellow, bewail, blare, bleat, bray, call, caterwaul, creak, cry, cry out, give tongue
- ululation, bark, bawl, call, caterwaul, clang, creak, cry, groan, grunt, howl, howling, keen, lament, moan, moaning
- Ulysses, Flying Dutchman, bird of passage, drifter, floater, gad, gadabout, go-about, itinerant, mover, peregrine, peripatetic, rambler, roamer, rolling stone, rover
- umbel, blossom, cone, head, pine cone, spike
- umber, beige, brown, brownish, brownish-yellow, brunet, chocolate, cinnamon, cocoa, cocoa-brown, coffee, coffee-brown, drab, dun, dun-brown, dun-drab
- umber-coloured, beige, brown, brunet, chocolate, drab, dun, ecru, fawn, hazel, khaki, lurid, seal, sepia, sorrel, tan
- umbilical, axial, central, concentrated, key, middle, midmost, pivotal
- umbilicus, axis, centre, centre of action, centre of gravity, centroid, core, dead centre, epicentre, heart, hub, kernel, marrow, medulla, middle, nave
- umbra, adumbration, dark shade, ghost, gloom, haunt, mere shadow, penumbra, phantasm, phantom, shade, shadiness, shadow, shadows numberless, silhouette, spook
- umbrage, adumbration, angry look, annoyance, dark shade, dirty look, dudgeon, enrage, exasperation, foliage, foliation, frown, fury, glare, gloom, glower
- umbrella, aegis, agency, air cover, air raid, air support, arm guard, awning, backstop, beach umbrella, blind, bombing, buffer, bulwark, bumper, chute
- umlaut, gradation, mark, mutation, phonetics, phonology
- umpire, act between, adjudge, adjudicate, adjudicator, arbiter, arbitrate, arbitrator, bargain, bencher, critic, go between, hear, his Lordship, his honour, his worship
- umpteen, number, parcel, several
- unabashed, arrant, barefaced, blatant, bold, bold as brass, boldfaced, brassy, brazen, flagrant, forward, immodest, impudent, lost to shame, notorious, overbold
- unabated, going strong, in full force, in full swing, undiminished, unflagging, unmitigated, unquenched, unreduced, unrestricted, unshaken, unworn
- unabbreviated, complete, developed, entire, full, global, intact, mature, matured, ripe, solid, total, uncut, undiminished, unexpurgated, whole
- unable to forget, haunted, mindful, obsessed, plagued, rankled
- unable to, incapable, incompetent, ineffective, inefficient, inept, inferior, unable, unfit, unqualified, untalented
