adj. 1 hard but brittle. 2 a (of air) bracing. b (of style or manner) lively, brisk and decisive. c (of features etc.) neat, clearcut. d (of paper) stiff and crackling. a (of hair) closely curling. n. (in full potato crisp) potato sliced thinly, fried, and sold in packets. o. make or become crisp. o crisply ado. crispness n. [Latin crisp us curled] crispbread n. 1 thin crisp biscuit of crushed rye etc. 2 these collectively (packet of crispbread).