demean vs humble

demean is not an adjective while humble is an adjective.

Word	Noun	Adjective	Verb	Adverb
demean	No	No	Yes	No
humble	No	Yes	Yes	No

As verbs, humble is a hypernym of demean; that is, humble is a word with a broader meaning than demean:

Other hypernyms of demean include abase, chagrin, humiliate, mortify.

demean (adjective)	humble (adjective)
	marked by meekness or modesty; not arrogant or prideful
	low or inferior in station or quality
	of low birth or station (`base' is archaic in this sense)
	used of unskilled work (especially domestic work)

demean (verb)	humble (verb)
reduce in worth or character, usually verbally	cause to feel shame; hurt the pride of
	cause to be unpretentious