tricky, insincere, wily, and shifty
trite, ordinary, commonplace, and hackneyed
trivial, petty, frivolous, and insignificant
true, upright, real, and authentic
tumultuous, riotous, disorderly, and turbulent
U
ugly, evil, hateful, and base
uncertain, questionable, erroneous, and mistaken
unctuous, shrill, brisk, and demonstrative [unctuous = exaggerated, insincere]
unhappy, unfortunate, distressed, and disastrous