不但 bùdàn HSK2 not only Definitions Defs Origin 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但 dàn adverbverb only Used to limit the scope of an action or state, meaning "only", "merely", or "just".