The word unhealthfulness 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: 28
Highest Scoring Words With Friends™ Play In The Letters unhealthfulness
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Seven Letter Word Alert: (68 words)
annulet, annulus, auletes, eluants, eluates, eluents, enfants, enseals, enthuse, ethanes, falsest, fastens, fatness, fellest, fennels, fetuses, flannel, flashes, flaunts, flenses, fleshes, fluents, flushes, fullest, funnels, funnest, hastens, hateful, hatfuls, hatless, healths, heathen, hueless, hustles, lateens, leaflet, leanest, leashes, lunates, lushest, lustful, neatens, nestles, netless, salutes, sateens, senates, sensate, sensual, sheathe, sheaths, sleuths, sulfate, sultans, sunhats, suntans, taluses, tealess, teasels, thallus, tuneful, tunnels, ululant, ululate, uneaten, unleash, unseals, unseats