Synonyms of uninteresting

1 Syllable
bland, flat, dull, drab, dry
2 Syllables
prosaic, stodgy, tedious, stupid, banal, singsong, blandest, dismal, pointless, snoozer, trite, tired, starcher, drearier, dragger, boring, dreary, dusty, blander, arid, humdrum, prosy, sing-song, vapid, common, stodgier, stale, nothing
3 Syllables
insipid, bromidic, jejune, irksome, fatiguing, nondescript, humorless, pedestrian, depressing, nowhere, tasteless, samely, unvaried, toneless
4 Syllables
unclassified, commonplace, unexciting, tiresome, unsatisfying, unfulfilling, soporific, dime-a-dozen, milk-and-water, uninspired, boresome, nongermane, disappointing, uninflected, monotonous, wearisome, unenjoyable, uninspiring, uneventful
5 Syllables
institutional, unpleasurable, reiterative, unstimulating, unmemorable, enervative, iterative, unappetizing, repetitive, unentertaining, unclassifiable, unmotivated