The word ungratifying 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: 24
Highest Scoring Words With Friends™ Play In The Letters ungratifying
:
Seven Letter Word Alert: (36 words)
annuity, arguing, faining, fairing, fraying, gaining, gaiting, gauntry, gifting, girning, gratify, grating, graying, gurning, ingraft, ingrain, inuring, nitrify, rafting, raining, ranging, ranting, rifting, ringgit, ringing, ruining, tinging, turfing, turning, unaging, unangry, ungraft, unitary, uniting, untying, yarning