The word unobtrusive 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™ Play In The Letters unobtrusive
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Seven Letter Word Alert: (45 words)
boniest, bousier, bovines, burnout, bustier, envious, inverts, nervous, nitrous, norites, nutsier, obtuser, obverts, orients, outburn, outruns, overbit, oversit, revuist, routine, rubouts, ruinous, sorbite, stonier, stourie, striven, suberin, subnote, subtone, subunit, subvein, subvent, subvert, subvote, tenuous, tonsure, tribune, triones, turbine, unburst, uniters, unrivet, unrobes, version, virtues