unexceptional vs undistinguished

unexceptional and undistinguished both are adjectives.

Word	Noun	Adjective	Verb	Adverb
unexceptional	No	Yes	No	No
undistinguished	No	Yes	No	No

As adjectives, unexceptional and undistinguished are synonyms defined as:

unexceptional and undistinguished: not special in any way; lacking distinction

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

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