| dead | (adverb) completely and without qualification; used informally as intensifiers | Synonyms: absolutely, perfectly, utterly |
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| (adverb) quickly and without warning; happening unexpectedly; on impulse; without premeditation | Synonyms: abruptly, all of a sudden, of a sudden, on the spur of the moment, short, suddenly |
| deadly | (adverb) (used as intensives) excessively | Synonyms: deucedly, devilishly, insanely, madly |
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| (adverb) as if dead | Synonyms: lifelessly |
| deadpan | (adverb) without betraying any feeling | - |
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| dear | (adverb) at a great cost | Synonyms: dearly |
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| (adverb) with affection | Synonyms: affectionately, dearly |
| dearly | (adverb) at a great cost | Synonyms: dear |
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| (adverb) with affection | Synonyms: affectionately, dear |
| (adverb) in a sincere and heartfelt manner | Synonyms: in a heartfelt way |
| deathly | (adverb) to a degree resembling death | - |
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| (adverb) to an extreme degree | Synonyms: exceedingly, extremely, super |