Unexceptional means ordinary, with nothing to make it stand out. An unexceptional meal.
It is a mild criticism, since nothing was wrong and nothing was memorable. Keep it apart from unexceptionable, which means nobody could object to it.
1adjectiveunexceptionalOrdinary, with nothing to make it stand out.
“The hotel was unexceptional in every possible way.”
unexceptional is a quality.
Also accepted in games: unremarkable
From un- + exceptional.
Etymology from Wiktionary, CC BY-SA