Word Study
unimpressive
OXFORD DICTIONARY
unimpressive, adj. not impressive.
Derivative
unimpressively adv. unimpressiveness n.
THESAURUS
unimpressive
back-burner, dinky, dispensable, immaterial, inappreciable, inconsequential, inconsiderable, inessential, inferior, insignificant, irrelevant, little, minor, minute, negligible, nonessential, not vital, petit, small, technical, unessential, unnoteworthyFor further exploring for "unimpressive" in Webster Dictionary Online