unglamourous vs humdrum

unglamourous is not a noun while humdrum is a noun.

Word	Noun	Adjective	Verb	Adverb
unglamourous	No	Yes	No	No
humdrum	Yes	Yes	No	No

As adjectives, unglamourous and humdrum are synonyms defined as:

Other synonyms of unglamourous include commonplace, prosaic, unglamorous.

unglamourous (noun)	humdrum (noun)
	the quality of wearisome constancy, routine, and lack of variety

unglamourous (adjective)	humdrum (adjective)
not challenging; dull and lacking excitement	tediously repetitious or lacking in variety
	not challenging; dull and lacking excitement