不完善 bùwánshàn imperfect 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完善 wánshàn adjective perfect perfect; consummate; well-developed and complete, such as a system or facility