modified
tedious, boring, tiresome, dreary, wearisome, prosaic, pedestrian, fatiguing, monotonous, dull, drab, colorless, stale, trite, commonplace, irksome, stupid, humdrum, prosy, flat, soporific, depressing, insipid, jejune, unentertaining, uninspiring, dismal, banal; see also dismal 1.
Antonyms interesting*, exciting, lively.