WordNet sense 1 (having a hardened crust as a covering):

encrusted, crusted, crustlike

WordNet sense 2 (overlaid or spread or topped with or enclosed within something; sometimes used as a combining form):

covered

WordNet sense 3 (brusque and surly and forbidding):

curmudgeonly, gruff, ill-humored, ill-humoured

WordNet sense 4 (having an irritable and unpleasant disposition):

ill-natured