The word unobservant 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 unobservant
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Seven Letter Word Alert: (46 words)
abortus, atoners, banners, banters, baronet, boaster, boaters, bonnets, boranes, borates, bravest, bravoes, bursate, butanes, nanobes, natures, nervous, neurons, neutron, nonarts, nonuser, obtuser, obverts, outearn, outrave, oversat, reboast, saunter, senator, servant, sorbate, stunner, subnote, subtone, subvent, subvert, subvote, tanners, taverns, tonsure, treason, turbans, unbones, unearnt, unrobes, urostea