The word uninteresting is playable in Words With Friends™, no blanks required. Because it is longer than 7 letters, you would have to play off an existing word or do it in several moves.
Words With Friends™ Letter Score: 19
Highest Scoring Words With Friends™ Plays In The Letters uninteresting
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Seven Letter Word Alert: (87 words)
engines, ensuing, ensuite, entries, entrust, genuine, gesture, greisen, gunners, gunters, gustier, gutsier, gutters, igniter, ignites, innings, integer, intense, intents, interns, intrust, intuits, inturns, inuring, nesting, netters, netting, neuters, nitrene, nitrite, nittier, nursing, nutsier, nutters, nuttier, nutting, regents, reining, rennets, rennins, renting, resting, retints, retunes, reunite, reusing, rinsing, ruining, running, rusting, rutting, setting, sinning, sitting, stinger, stunner, stunter, suiting, sunnier, sunning, tenners, tensing, tenters, tentier, tenting, tenures, testier, testing, tiering, tiniest, tinners, tinnier, tinning, tinters, tintier, tinting, treeing, trienes, trustee, tunings, turning, uniters, unities, uniting, unreset, unrisen, uterine