undistinguished vs unexceptional

undistinguished and unexceptional both are adjectives.

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

As adjectives, undistinguished and unexceptional are synonyms defined as:

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

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

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