ill-humoured vs crusty

ill-humoured and crusty both are adjectives.

Word	Noun	Adjective	Verb	Adverb
ill-humoured	No	Yes	No	No
crusty	No	Yes	No	No

As adjectives, ill-humoured and crusty are synonyms defined as:

Other synonyms of ill-humoured include curmudgeonly, gruff, ill-humored.

ill-humoured (adjective)	crusty (adjective)
brusque and surly and forbidding	having a hardened crust as a covering
	brusque and surly and forbidding