in·ci·sive /ɪnˈsaɪsɪv/
  (a.)敏銳的,機敏的,激烈的,切入的,鋒利的
  in·ci·sive /ɪnˈsaɪsɪv/ 形容詞
  (拉,incisivus)切牙的,切的
  In·ci·sive a.
  1. Having the quality of incising, cutting, or penetrating, as with a sharp instrument; cutting; hence, sharp; acute; sarcastic; biting; trenchant. “An incisive, high voice.”
  And her incisive smile accrediting
  That treason of false witness in my blush.   --Mrs. Browning.
  2. Anat. Of or pertaining to the incisors; incisor; as, the incisive bones, the premaxillaries.
  ◄ ►
  incisive
       adj 1: having or demonstrating ability to recognize or draw fine
              distinctions; "an acute observer of politics and
              politicians"; "incisive comments"; "icy knifelike
              reasoning"; "as sharp and incisive as the stroke of a
              fang"; "penetrating insight"; "frequent penetrative
              observations" [syn: acute, discriminating, keen,
               knifelike, penetrating, penetrative, piercing,
               sharp]
       2: very penetrating and clear and sharp in operation; "an
          incisive mind"; "a keen intelligence"; "of sharp and
          active intellect" [syn: keen, sharp]
       3: suitable for cutting or piercing; "incisive teeth"; "the
          piercing needle" [syn: piercing]