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Adjective: penetrative  'pe-ni,trey-tiv [N. Amer], pe-nu-tru-tiv [Brit]
  1. Having or demonstrating ability to recognize or draw fine distinctions
    "frequent penetrative observations";
    - acute, discriminating, incisive, keen, knifelike, penetrating, piercing, sharp
     
  2. Tending to penetrate; having the power of entering or piercing
    "a toxic penetrative spray applied to the surface";
    - penetrating

See also: perceptive, sharp