| treacherously | (adverb) in a disloyal and faithless manner | Synonyms: faithlessly, false, traitorously, treasonably |
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| ulteriorly | (adverb) in an ulterior manner | - |
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| unalterably | (adverb) in an unalterable and unchangeable manner | Synonyms: immutably, unassailably, unchangeably |
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| unassertively | (adverb) in an unassertive manner | - |
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| unceremoniously | (adverb) in an unceremonious manner | - |
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| uncertainly | (adverb) showing lack of certainty | - |
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| (adverb) in an unsteady manner | Synonyms: falteringly, unsteadily |
| uncharacteristically | (adverb) in uncharacteristic manner | - |
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| unconcernedly | (adverb) in an indifferent manner | - |
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| uncontroversially | (adverb) not involving any controversy | - |
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| undecipherably | (adverb) in an illegible manner | Synonyms: illegibly, unreadably |
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| under | (adverb) further down | Synonyms: below |
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| (adverb) down below | - |
| (adverb) below the horizon | - |
| (adverb) below some quantity or limit | - |
| (adverb) in or into a state of subordination or subjugation | - |
| (adverb) down to defeat, death, or ruin | - |
| (adverb) into unconsciousness | - |
| (adverb) through a range downward | - |
| underarm | (adverb) with the hand swung below shoulder level | Synonyms: underhand |
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| underfoot | (adverb) under the feet | - |
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| (adverb) in the way and hindering progress | - |
| underground | (adverb) beneath the surface of the earth | - |
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| (adverb) in or into hiding or secret operation | - |
| underhand | (adverb) with the hand swung below shoulder level | Synonyms: underarm |
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| (adverb) slyly and secretly | Synonyms: underhandedly |
| underhandedly | (adverb) slyly and secretly | Synonyms: underhand |
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| underneath | (adverb) under or below an object or a surface; at a lower place or level; directly beneath | - |
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| (adverb) on the lower or downward side; on the underside of | - |
| understandably | (adverb) in an intelligible manner | Synonyms: clearly, intelligibly |
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| understandingly | (adverb) with understanding | - |
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| undeservedly | (adverb) in an unmerited manner | - |
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| unenergetically | (adverb) without energy; in a lethargic manner | Synonyms: lethargically |
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| unerringly | (adverb) without making errors | - |
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| unfalteringly | (adverb) with determination; in a determined manner | Synonyms: determinedly, unshakably |
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| unilaterally | (adverb) in a unilateral manner; by means of one part or party | Synonyms: one-sidedly |
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| uninterestingly | (adverb) in an uninteresting manner | - |
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| uninterruptedly | (adverb) without interruption | - |
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| universally | (adverb) in every case | - |
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| unmercifully | (adverb) without pity; in a merciless manner | Synonyms: mercilessly, pitilessly, remorselessly |
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| unreservedly | (adverb) without reservation | - |
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| unsufferably | (adverb) to an insufferable degree | Synonyms: insufferably |
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| unswervingly | (adverb) without swerving; in a direct and unswerving manner | - |
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| (adverb) in a constant and steadfast manner | - |
| ununderstandably | (adverb) in an unintelligible manner | Synonyms: unintelligibly |
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| unutterably | (adverb) to an inexpressible degree | Synonyms: indescribably, ineffably, inexpressibly, unspeakably |
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| unwaveringly | (adverb) with resolute determination | Synonyms: firm, firmly, steadfastly |
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| uppermost | (adverb) in or into the highest position | - |
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| (adverb) in or into the most prominent position, as in the mind | - |
| upriver | (adverb) toward the source or against the current | Synonyms: upstream |
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| utterly | (adverb) completely and without qualification; used informally as intensifiers | Synonyms: absolutely, dead, perfectly |
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| verbally | (adverb) as a verb | - |
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| (adverb) by means of language | - |
| verbatim | (adverb) using exactly the same words | Synonyms: word for word |
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| verbosely | (adverb) in a verbose manner | Synonyms: long-windedly, windily, wordily |
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| verily | (adverb) in truth; certainly | - |
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| vertically | (adverb) in a vertical direction | - |
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| very | (adverb) used to give emphasis | Synonyms: rattling, real, really |
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| (adverb) precisely so | - |
| viscerally | (adverb) in the viscera | - |
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| (adverb) in an unreasoning visceral manner | Synonyms: unreasoningly |
| vociferously | (adverb) in a vociferous manner | - |
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| vulnerably | (adverb) in a vulnerable manner | - |
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| westerly | (adverb) in a westward direction | - |
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| (adverb) from the west | - |
| wheresoever | (adverb) where in the world; location, singular, elective existential pronoun | Synonyms: wherever |
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| wherever | (adverb) where in the world; location, singular, elective existential pronoun | Synonyms: wheresoever |
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| witheringly | (adverb) in a withering manner | - |
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| wonderfully | (adverb) (used as an intensifier) excellently | Synonyms: marvellously, marvelously, superbly, terrifically, toppingly, wondrous, wondrously |
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| wonderingly | (adverb) in a curious and questioning manner | Synonyms: questioningly |
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| yesterday | (adverb) on the day preceding today | - |
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| (adverb) in the recent past; only a short time ago | - |
| yonder | (adverb) at or in an indicated (usually distant) place (`yon' is archaic and dialectal) | Synonyms: yon |
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