crusty

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Having, resembling, or being a crust.
• adjective Outspoken and surly. Used especially of older people.

from The Century Dictionary.

• Like crust; of the nature of crust; hard: as, a crusty surface or substance.
• Peevish; snappish; surly; harshly curt in manner or speech.

from the GNU version of the Collaborative International Dictionary of English.

• adjective Having the nature of crust; pertaining to a hard covering.
• adjective Having a hard exterior, or a short, rough manner, though kind at heart; snappish; peevish; surly.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective Pertaining to or having a crust, as, for example, in the case of bread.
• adjective figuratively, of a person or behavior Short-tempered and gruff but, sometimes, with a harmless or benign inner nature; peevish, surly, harsh.
• noun chiefly UK A tramp or homeless young person with poor cleanliness.
• noun slang Dried eye mucus.
• noun chiefly UK A member of an urban subculture with roots in punk and grebo, characterized by antiestablishment attitudes and an unkempt appearance.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• adjective brusque and surly and forbidding
• adjective having a hardened crust as a covering