run-of-the-mill vs unexceptional

run-of-the-mill and unexceptional both are adjectives.

Word	Noun	Adjective	Verb	Adverb
run-of-the-mill	No	Yes	No	No
unexceptional	No	Yes	No	No

As adjectives, run-of-the-mill and unexceptional are synonyms defined as:

run-of-the-mill and unexceptional: not special in any way; lacking distinction

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

run-of-the-mill (adjective)	unexceptional (adjective)
not special in any way; lacking distinction	not special in any way; lacking distinction