| drudging | (adjective) doing arduous or unpleasant work | Synonyms: laboring, labouring, toiling |
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| drugged | (adjective) under the influence of narcotics | Synonyms: doped, narcotised, narcotized |
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| drugless | (adjective) without the use of drugs | - |
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| drumhead | (adjective) performed speedily and without formality | Synonyms: summary |
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| drunk | (adjective) stupefied or excited by a chemical substance (especially alcohol) | Synonyms: gone, inebriated, intoxicated, ripped |
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| (adjective) as if under the influence of alcohol | Synonyms: intoxicated |
| drunken | (adjective) given to or marked by the consumption of alcohol | Synonyms: bibulous, boozy, sottish |
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| drupaceous | (adjective) of or related to a drupe | - |
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| humdrum | (adjective) tediously repetitious or lacking in variety | Synonyms: monotonous |
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| (adjective) not challenging; dull and lacking excitement | Synonyms: commonplace, prosaic, unglamorous, unglamourous |
| quadruped | (adjective) having four feet | Synonyms: four-footed, quadrupedal |
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| quadrupedal | (adjective) having four feet | Synonyms: four-footed, quadruped |
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| quadruple | (adjective) four times as great or many | Synonyms: four-fold, fourfold |
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| (adjective) having four units or components | Synonyms: four-fold, fourfold, quadruplex, quadruplicate |
| quadruplex | (adjective) having four units or components | Synonyms: four-fold, fourfold, quadruple, quadruplicate |
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| quadruplicate | (adjective) having four units or components | Synonyms: four-fold, fourfold, quadruple, quadruplex |
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