The word insufficiently 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: 29
Highest Scoring Words With Friends™ Play In The Letters insufficiently
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Seven Letter Word Alert: (50 words)
clients, cuisine, cutline, cystine, elicits, fifties, fistful, fistule, fluency, fluents, funfest, funnels, funnest, funnies, funnily, futiley, ileitis, incites, incline, infects, inflect, inflict, inlines, instyle, insulin, inulins, linnets, lucites, luniest, niftily, scuffle, sniffle, sniffly, snuffle, snuffly, stencil, stiffen, stiffly, suffice, sulfite, sunnily, tinfuls, tinnily, tunnels, unfitly, unifies, unities, unsilty, utensil, utilise