The word untimbered 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 untimbered
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Seven Letter Word Alert: (33 words)
bedtime, bemired, bendier, betimed, birdmen, bitumen, demerit, denture, detinue, detuner, dimeter, erudite, inbreed, intrude, merited, minuter, mitered, munited, rebited, remined, retimed, retuned, reunite, runtime, tenured, terbium, tribune, turbine, unembed, untimed, untired, untried, uterine