The crusty baker may sound rude, but his bread is absolutely delicious.

crusty 是由名词 crust（面包皮、外壳）加上形容词后缀 -y 构成的形容词，本义是"有硬壳的"，引申为"脾气暴躁的、粗鲁的"，常用来形容人外表或态度强硬但内心可能不错。