keen Synonyms

acute piercing sharp cutting penetrating biting ardent eager shrewd groovy great lament prompt incisive cracking dandy corking smashing nifty peachy neat discriminating swell shrill strong sharp-witted sharper studious severe sentient thanatopsis sensitive sedulous searching spiked stinging spiky spicular solicitous sob spinous spiny stabbing snivel stellated smart spicy sleepless skirl searing