unexceptional vs mine run

unexceptional and mine run both are adjectives.

Word	Noun	Adjective	Verb	Adverb
unexceptional	No	Yes	No	No
mine run	No	Yes	No	No

As adjectives, unexceptional and mine run are synonyms defined as:

Other synonyms of unexceptional include run-of-the-mill, run-of-the-mine, undistinguished.

unexceptional (adjective)	mine run (adjective)
not special in any way; lacking distinction	not special in any way; lacking distinction