perceptive,"['acute ', 'discriminating ', 'incisive ', 'keen ', 'knifelike ', 'penetrating ', 'penetrative ', 'piercing ', 'sharp ', 'apprehensive ', 'discerning ', 'apperceptive ', 'insightful ', 'observant ', 'observing ', 'quicksighted ', 'sharpsighted ', 'sharpeyed ', 'subtle ', 'understanding ', 'unperceptive ']"