incisive
adj.
early 15c., inscisif, "slashing, cutting with a sharp edge," from Middle French incisif and directly from Medieval Latin incisivus, from Latin incis-, past participle stem of incidere (see incision). Originally literal; figurative sense of "mentally acute" first recorded 1850 as a borrowing from French. Related: Incisively; incisiveness.
〔蒋〕[见incise，-ive形容词后缀，…的] 能切入的，锋利的，尖锐的
〔李〕[in-=into入；cis=to cut切；-ive a.=like像……的→“like cutting into像刀切进去一般”→] a. cutting;sharp or keen锐利的；透彻的