incisive or keen, as language or a person; caustic; cutting

trenchant wit.

vigorous; effective; energetic

a trenchant policy of political reform.

clearly or sharply defined; clear-cut; distinct.

adjective

frivolous , gentle , impotent , kind , nice , weak

adjective

acerbic , acid , acidulous , acute , astringent , biting , caustic , clear , clear-cut , crisp , critical , crushing , cutting , distinct , driving , dynamic , effective , effectual , emphatic , energetic , explicit , forceful , forcible , graphic , hurtful , impressive , incisive , intense , keen , mordant , penetrating , piquant , pointed , potent , powerful , pungent , razor-sharp , salient , salty * , sardonic , sententious , severe , sharp , significant , strong , tart , to the point , unequivocal , unsparing , vigorous , weighty , well-defined , perceptive , probing , sensitive , acidic , acrid , corrosive , mordacious , scathing , slashing , stinging , truculent , vitriolic , sarcastic