Compare unexceptional with other words:
unexceptionable vs. unexceptional
plain vs. unexceptional
mundane vs. unexceptional
average vs. unexceptional
acceptable vs. unexceptional
exceptional vs. unexceptional
middling vs. unexceptional
commonplace vs. unexceptional
meh vs. unexceptional
nondescript vs. unexceptional
pedestrian vs. unexceptional