keen Synonyms

sharp piercing ardent acute eager shrewd cutting penetrating biting avid discerning quick discriminating astute quick-witted smashing corking incisive cracking great intense groovy nifty dandy prompt enthusiastic peachy passionate swell neat strong alert lament perceptive shrill subtle sharp-witted sharper severe spiked sentient sensitive stinging spicy perfervid spiky solicitous sob spinous spiny