The word uninjectable 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: 31
Highest Scoring Words With Friends™ Play In The Letters uninjectable
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Seven Letter Word Alert: (24 words)
abjunct, abluent, ancient, annulet, cabinet, canteen, catenin, cauline, citable, cuneate, cutline, incubee, jubilee, lenient, leucine, leucite, lineate, lunatic, nebulae, tenable, tunable, unblent, unclean, uneaten