acrid, acute, astute, bitter, brainy, bright, clever, cute, edge, hackly, hard, harsh, horny, hot,
incisive, inclement, keen, keener, keenest, luminous, mercurial, nimble, nippy, penetrable, penetrating, peppery, perspicacious, pervasive, piercing, poignant, pointed, pungent, quick, quick-witted, rapid, sagacious, severe, sharp, sharp-witted, short, shrewd, shrill, smart, spry, steep, strident, stringent, swift, versatile, violent, witty