匪夷所思 fěiyísuǒsī unimaginable Origin Definitions Defs Strokes Stroke Words Sentences Sents 匪 fěi not (literary) used to express negation, similar to 不 bù or 非 fēi夷 yí ordinary (bound form) common; ordinary; usual所思 suǒsī thoughts one's thoughts or what one is thinking about