The word fainthearted 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™ Play In The Letters
Seven Letter Word Alert: (52 words)
aerated, afeared, airdate, airhead, arenite, attired, defiant, definer, dentate, detrain, diether, draftee, earthed, earthen, entreat, fainted, fainter, fathead, fattier, feather, fireant, fretted, hairnet, handier, headier, hearted, hearten, heftier, hetaera, indraft, iterate, nattier, neither, nitrate, radiant, radiate, rainhat, refined, tainted, tentier, ternate, theater, theatre, thereat, therein, tiaraed, tradein, trained, trainee, treated, triaene, trident