The word effortlessness 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: 22
Highest Scoring Words With Friends™ Play In The Letters effortlessness
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Seven Letter Word Alert: (45 words)
efforts, entrees, estrone, feelers, festers, fleeter, flenser, flenses, florets, flosses, foresee, forests, forseen, fosters, lessees, lessens, lessons, lessors, nesters, nestles, netless, offense, offsets, oftener, oneself, osselet, ostlers, relents, renests, resents, resoles, roselet, sensors, setoffs, softens, sonless, stenose, stereos, sterols, stoners, tensors, toeless, toffees, tossers, tresses