Etymology
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incisive (adj.)

early 15c., inscisif, "slashing, cutting with a sharp edge," from Old French incisif (medical) "invasive, effective," and directly from Medieval Latin incisivus, from Latin incis-, past participle stem of incīdere "to cut into" (see incision). Originally literal; figurative sense of "mentally acute, sharply and clearly expressive" first recorded 1850 as a borrowing from French. Related: Incisively; incisiveness.

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Definitions of incisive

incisive (adj.)
having or demonstrating ability to recognize or draw fine distinctions;
as sharp and incisive as the stroke of a fang
incisive comments
Synonyms: acute / discriminating / keen / knifelike / penetrating / penetrative / piercing / sharp
incisive (adj.)
suitable for cutting or piercing;
incisive teeth
From wordnet.princeton.edu