Incisive /(?)/

In·ci·sive

Incisive

a.
  1. Having the quality of incising, cutting, or penetrating, as with a sharp instrument; cutting;
    And her incisive smile accrediting That treason of false witness in my blush.
  2. Of or pertaining to the incisors; incisor; as, the incisive bones, the premaxillaries. (Anat.)
  3. Clearly and succinctly stated, with penetrating insight into the issue at hand; as, an incisive comment.