unremarkable vs quotidian

unremarkable and quotidian both are adjectives.

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

As adjectives, unremarkable and quotidian are synonyms defined as:

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

unremarkable (adjective)	quotidian (adjective)
found in the ordinary course of events	found in the ordinary course of events