不小心 bùxiǎoxīn carelessly 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小心 xiǎoxīn adjectiveverb careful to be careful; to take care; cautious or prudent