adjective

lacking strong features or characteristics and therefore uninteresting.

bland, mass-produced pop music

uninteresting,dull,boring,tedious,monotonous,dry,drab,dreary,wearisome,unexciting,unimaginative,uninspiring,uninspired,weak,insipid,colourless,lustreless,lacklustre,vapid,flat,stale,trite,vacuous,feeble,pallid,wishy-washy,limp,lame,tired,lifeless,torpid,unanimated,zestless,spiritless,sterile,anaemic,barren,tame,bloodless,antiseptic,middle-of-the-road,run-of-the-mill,commonplace,mediocre,nondescript,characterless,mundane,inoffensive,humdrum,prosaic