The word impracticable 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™ Plays In The Letters impracticable
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Seven Letter Word Alert: (82 words)
abreact, acclaim, acerbic, actable, airable, airmail, airtime, albitic, amiable, aplitic, aptamer, apteria, article, balmier, bimetal, breccia, cabaret, cacemia, calcite, caliber, calibre, caliper, caltrap, cambial, cambric, campier, capable, capital, caramel, ceramic, ciliate, circlet, citable, claimer, clamber, clamper, climate, climber, clipart, crimple, empiric, icepail, icteric, impaler, imperil, labiate, lempira, limiter, macabre, mailcar, maltier, marital, marlite, martial, metical, militar, miracle, palmate, palmier, parable, partial, patrial, pelitic, picrate, picrite, placate, plicate, practic, primate, racemic, recital, reclaim, reclamp, reclimb, replait, replica, tamable, tilapia, timbale, timbrel, trample, triable