The word unmeasurable 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: 22
Highest Scoring Words With Friends™ Plays In The Letters unmeasurable
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Seven Letter Word Alert: (50 words)
alarums, albumen, alumnae, alumnus, amblers, arsenal, auburns, baleens, banaler, baseman, basemen, bemauls, besmear, blamers, bureaus, enabler, enables, enamels, leaners, lumbers, manuals, manures, marbles, marulas, maulers, measure, mensual, nabales, nebulae, nebular, nebulas, neurula, numbers, numeral, rambles, rebales, reblame, renames, rumbles, serumal, slumber, subarea, submenu, subrule, sunbeam, surname, unbales, unblurs, unreels, useable