不臣 bùchén to fail in one's duty as a subject 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臣 chén subject A high official or a subject of a monarch in dynastic China