adjective

(especially of a comment or style of speaking) sharp and forthright.

his acerbic wit

sharp,sarcastic,sardonic,satirical,scathing,cutting,razor-edged,incisive,penetrating,piercing,biting,stinging,searing,keen,caustic,trenchant,bitter,acrimonious,astringent,harsh,severe,devastating,abrasive,wounding,hurtful,unkind,cruel,vitriolic,virulent,mordant,venomous,waspish,poisonous,spiteful,vicious,malicious