The word undisplayable 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: 26
Highest Scoring Words With Friends™ Plays In The Letters
Seven Letter Word Alert: (88 words)
ablepsy, abludes, abulias, alanyls, albinal, aliased, allayed, alludes, alpines, analyse, anapsid, audible, audibly, ballads, ballpen, banally, basally, bedpans, belauds, bipedal, biplane, blandly, blindly, bullied, bullies, bullpen, bundles, bylined, bylines, denials, diabase, dialups, dialyse, disable, disally, dispell, display, diynals, dualise, dyspnea, endplay, ideally, inulase, labials, lapland, lesbian, lineups, lupines, nabales, nasally, nebulas, paellas, paenula, paisley, palsied, payable, piebald, pinball, plainly, plebian, pliable, pliably, pulleys, salable, salably, sayable, snailed, snidely, spalled, spaniel, spilled, spindle, spindly, spinule, splayed, splined, subpial, sullied, sundial, sunlily, unbaled, unbales, unideal, unipeds, unplays, unspell, uplands, useably