trenchant

Synonyms: 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 razorsharp salient salty sardonic sententious severe sharp significant strong tart to the point unequivocal unsparing vigorous weighty well-defined

Antonyms: frivolous gentle impotent kind nice weak