不眠 bùmián sleepless Origin Definitions Defs Strokes Stroke Words Sentences Sents 不 bù adverb not Negative adverb used before verbs, adjectives, and other adverbs to indicate negation; also used as a bound-form prefix to form terms with opposite meanings眠 mián verb to sleep (bound form) to sleep; to slumber; also used in words like 睡眠 shuìmián