unstylish vs old

unstylish is not a noun while old is a noun.

Word	Noun	Adjective	Verb	Adverb
unstylish	No	Yes	No	No
old	Yes	Yes	No	No

unstylish (noun)	old (noun)
	past times

unstylish (adjective)	old (adjective)
lacking in style or elegance	of long duration; not new
not in accord with or not following current fashion	(used especially of persons) having lived for a relatively long time or attained a specific age
	skilled through long experience
	(used for emphasis) very familiar
	excellent
	just preceding something else in time or order
	belonging to some prior time