Adjective crusty has 2 senses
  1. crusted, encrusted, crusty, crustlike - having a hardened crust as a covering
    Antonym: uncovered (indirect, via covered)
  2. crusty, curmudgeonly, gruff, ill-humored, ill-humoured - brusque and surly and forbidding; "crusty remarks"; "a crusty old man"; "his curmudgeonly temper"; "gruff manner"; "a gruff reply"
    Antonym: good-natured (indirect, via ill-natured)
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