Similar word to unentertaining:

arid, banal, big yawn, bromidic, common, commonplace, depressing, dismal, drab, dreary, dry, dull, dusty, fatiguing, flat, ho hum, humdrum, insipid, irksome, jejune, monotonous, nothing, nowhere, pedestrian, prosaic, prosy, soporific, stale, stupid, tedious, tired, tiresome, trite, unenjoyable, unentertaining, unexciting, uninspiring, wearisome