The word hatefulness 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: (45 words)
auletes, eluants, eluates, eluents, enseals, enthuse, ethanes, falsest, fastens, fatness, fetuses, flashes, flaunts, flenses, fleshes, fluents, flushes, hastens, hateful, hatfuls, hatless, hueless, hustles, lateens, leanest, leashes, lunates, lushest, nestles, netless, salutes, sateens, senates, sensate, sensual, sleuths, sulfate, sultans, sunhats, taluses, tealess, teasels, unleash, unseals, unseats