INCISIVE

incisive. Incisive, a. having the quality of cutting, sharp

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In‐ci″sive (?), a. [[Cf. F. incisif.]] 1. 1. Having the quality of incising, cutting, or penetrating, as with a sharp instrument; cutting; hence, sharp; acute; sarcastic; biting. “An incisive, high voice.” G. Eliot.
And her incisive smile accrediting That treason of false witness in my blush. Mrs. Browning. 2. 2. (Anat.) Of or pertaining to the incisors; incisor; as, the incisive bones, the premaxillaries.