lackluster(not exceptional; not worthy of special merit, attention, or interest; having no vitality) adjective [UK: ˈlæ.ˌklə.stə(r)] [US: ˈlæ.ˌklə.stər]
uninteresting(arousing little or no interest; boring or uneventful) adjective [UK: ʌn.ˈɪn.trəst.ɪŋ] [US: ʌ.ˈnɪn.trə.stɪŋ]