The word unportable 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: 19
Highest Scoring Words With Friends™ Plays In The Letters unportable
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Seven Letter Word Alert: (28 words)
abluent, baronet, bloater, blunter, butanol, nebular, nepotal, neutral, notable, operant, opulent, outearn, outleap, outplan, planter, plouter, potable, poulter, probate, pronate, protean, replant, rubeola, taboule, trouble, tunable, unalert, unalter