adj. 25B6; adjective
crusty French bread : CRISP, crispy, well baked; crumbly, brittle, friable.
a crusty old man : IRRITABLE, cantankerous, irascible, bad-tempered, ill-tempered, grumpy, grouchy, crotchety, short-tempered, tetchy, testy, crabby, curmudgeonly, peevish, cross, fractious, pettish, crabbed, prickly, waspish, peppery, cross-grained; informal snappish, snappy, chippy; Brit. informal stroppy, narky, ratty; N. Amer. informal cranky, ornery; Austral./NZ informal snaky.
soft, good-natured.