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Adjective: incisive  in'sI-siv
  1. Having or showing quick and precise discernment or understanding; mentally perceptive and astute
    "incisive comments"; "as sharp and incisive as the stroke of a fang";
    - acute, discriminating, keen, knifelike, penetrating, penetrative, piercing, sharp
     
  2. (of speech or writing) clear, direct, and effectively expressing the key points
    "Her incisive summary captured the main arguments"
     
  3. Suitable for cutting or piercing
    "incisive teeth"

See also: perceptive, sharp

Encyclopedia: Incisive