unremarkable vs mundane

unremarkable and mundane both are adjectives.

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

As adjectives, unremarkable and mundane are synonyms defined as:

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

unremarkable (adjective)	mundane (adjective)
found in the ordinary course of events	belonging to this earth or world; not ideal or heavenly
	found in the ordinary course of events
	concerned with the world or worldly matters