The word ununderstood 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: 18
Highest Scoring Words With Friends™ Plays In The Letters ununderstood
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Seven Letter Word Alert: (41 words)
dendron, desnood, detours, duteous, neurons, neutron, nodders, nonuser, onerous, outdoer, outdoes, outdone, outrode, outruns, redound, resound, rodents, roosted, rotunds, rounded, snooded, snooted, snorted, snouted, sounded, sounder, stunned, stunner, sutured, tendons, tenuous, tonsure, trodden, turndun, undents, undoers, undosed, undrest, unnoted, unsound, untuned