adjective

based on or in accordance with what is generally done or believed.

a conventional morality had dictated behaviour

normal,standard,regular,ordinary,usual,traditional,typical,common,common or garden,garden variety,run-of-the-mill,prosaic,pedestrian,commonplace,unimaginative,uninspired,uninspiring,unadventurous,unremarkable,unexceptional,unoriginal,derivative,formulaic,predictable,stock,hackneyed,clichéd,stereotypical,stereotyped,trite,platitudinous,old hat,plain vanilla,bog-standard,hacky,formalistic