Etymology
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crusty (adj.)

c. 1400, "scabby, like a crust, hard," from crust (n.) + -y (2). Figurative use, of persons, "short-tempered, surly, peevish" is from 1560s.

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Definitions of crusty

crusty (adj.)
having a hardened crust as a covering;
Synonyms: crusted / encrusted / crustlike
From wordnet.princeton.edu