The word unsteadiness 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 unsteadiness
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Seven Letter Word Alert: (62 words)
adenine, aniseed, assents, auditee, aunties, densest, dentine, dentins, desists, destain, destine, detains, detinue, detunes, disease, dissent, dunites, easiest, ensuite, indents, instead, intends, intense, neatens, nudists, nutseed, sadists, sadness, sainted, sateens, sauteed, seaside, sedates, seitans, seitens, senates, sensate, sestina, sestine, siennas, siestas, sinuate, sinuses, snidest, stained, standee, studies, stunned, sudates, sundaes, sunnies, sunsets, suntans, sustain, tissued, tissues, undents, undines, uneaten, unsated, unseats, unstain