The word unperceivable 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 unperceivable
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Seven Letter Word Alert: (63 words)
auricle, beeline, believe, bereave, biplane, bleeper, bluecap, caliber, calibre, caliper, carbeen, carbene, carbine, cauline, caviler, clavier, cleaner, cleanup, cleaver, crubeen, cuprene, curable, enabler, enclave, epicene, epicure, eupneic, evacuee, incubee, incurve, inplace, leucine, nebulae, nebular, nuclear, panicle, pelican, plainer, plebian, pleurae, praline, prevail, puerile, receive, reclean, recline, relieve, repanel, replace, replane, replica, revalue, revenue, unbrace, unclear, unravel, unreeve, valence, veinule, velaric, veneral, verbena, vulpine