adj .
cutting right to the heart of the matter ; 문제의 핵심을 찌르는, 날카로운

• When a surgeon cuts into you, he or she makes an incision. To be incisive is to be as sharp as a scalpel in a figurative sense.
  외과의사가 수술을 하려면 칼로 절개를 해야 한다. incisive 는 비유적인 의미로 수술용 메스만큼 날카롭다는 뜻이다.
• After hours of debate, Louis offered a few incisive comments that made it immediately clear to everyone how dumb the original idea had been.
• Lloyd's essay were always incisive ; he never wasted any words, and his reasoning was always sharp and persuasive.