The word unthreatening 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: 21
Highest Scoring Words With Friends™ Plays In The Letters unthreatening
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Seven Letter Word Alert: (72 words)
antigen, arenite, earning, earthen, eighter, entrain, entrant, entreat, gaunter, gentian, genuine, granite, grantee, greaten, guanine, hairnet, hatting, haunter, hearing, hearten, heating, hunting, hurting, hutting, ingrate, integer, iterate, nattier, nearing, neither, netting, nitrate, nitrene, nuttier, nutting, ranting, ratting, reagent, regnant, rehinge, renting, reunite, running, rutting, tangent, tangier, tanning, taunter, tauting, tearing, tentage, tentier, tenting, ternate, theater, theatre, thereat, therein, thinner, tighten, tighter, trainee, treeing, triaene, turning, uneager, unearnt, unearth, uneaten, unhinge, urinate, uterine