The word platitudinous 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: 21
Highest Scoring Words With Friends™ Plays In The Letters platitudinous
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Seven Letter Word Alert: (52 words)
altoist, astound, daltons, dialups, diptail, distant, dopants, dualist, dustpan, idolist, intuits, inuloid, liaison, nuptial, outlast, outplan, outputs, outsail, outspan, outspin, outspun, pianist, pinitol, pintail, plastid, plaudit, plutons, poundal, pundits, sandpit, slipout, spinout, spionid, spotlit, standup, station, stipula, sundial, tailpin, talonid, tinpots, topsail, tuition, unipods, unloads, unsplit, uplands, uploads, upsilon, upslant, utopian, utopias