unremarkable vs everyday

unremarkable and everyday both are adjectives.

Word	Noun	Adjective	Verb	Adverb
unremarkable	No	Yes	No	No
everyday	No	Yes	No	No

As adjectives, unremarkable and everyday are synonyms defined as:

Other synonyms of unremarkable include mundane, quotidian, routine, workaday.

unremarkable (adjective)	everyday (adjective)
found in the ordinary course of events	commonplace and ordinary
	appropriate for ordinary or routine occasions
	found in the ordinary course of events