The word unsteadily 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: 16
Highest Scoring Words With Friends™ Play In The Letters unsteadily
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Seven Letter Word Alert: (50 words)
aunties, delints, denials, density, dentals, dentils, destain, destiny, details, detains, dialyse, dilates, diluent, dilutes, distyle, diynals, dualise, dualist, duality, duelist, dunites, dustily, elastin, eluants, entails, instead, instyle, inulase, lunated, lunates, luniest, nailset, nastily, sainted, saintly, salient, saluted, sinuate, slanted, snailed, snidely, stained, sundial, tuesday, undealt, unideal, unsated, unsilty, untiled, utensil