| sturdily | (adverb) in a sturdy manner | - |
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| supernaturally | (adverb) in a supernatural manner | Synonyms: preternaturally |
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| sure | (adverb) definitely or positively (`sure' is sometimes used informally for `surely') | Synonyms: certainly, for certain, for sure, sure as shooting, sure enough, surely |
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| surely | (adverb) definitely or positively (`sure' is sometimes used informally for `surely') | Synonyms: certainly, for certain, for sure, sure, sure as shooting, sure enough |
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| surgically | (adverb) in a surgical manner; by means of surgery | - |
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| surlily | (adverb) in a churlish manner | Synonyms: churlishly |
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| surpassingly | (adverb) to an extraordinary degree | Synonyms: passing |
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| surprisedly | (adverb) in the manner of one who is surprised | - |
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| surprisingly | (adverb) in a surprising manner | - |
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| (adverb) in an amazing manner; to everyone's surprise | Synonyms: amazingly, astonishingly |
| surreptitiously | (adverb) in a surreptitious manner | Synonyms: sneakily |
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| taciturnly | (adverb) without speaking | Synonyms: mutely, silently, wordlessly |
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| torturously | (adverb) in a very painful manner | Synonyms: agonizingly, excruciatingly |
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| turbulently | (adverb) in a turbulent manner; with turbulence | - |
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| (adverb) in a stormy or violent manner | Synonyms: passionately, stormily |
| turgidly | (adverb) in a turgid manner | Synonyms: bombastically |
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| unfavourably | (adverb) showing disapproval; in a disparaging way | Synonyms: unfavorably |
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| unhurriedly | (adverb) without haste | - |
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| unnaturally | (adverb) not according to nature; not by natural means | Synonyms: artificially, by artificial means |
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| (adverb) in an unnatural way | - |
| (adverb) in a manner at variance with what is natural or normal | - |
| urbanely | (adverb) in an urbane manner | - |
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| urgently | (adverb) with great urgency | Synonyms: desperately |
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| usuriously | (adverb) to an exorbitant degree | Synonyms: exorbitantly, extortionately |
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| voyeuristically | (adverb) like a voyeur | - |
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