The word unreliability 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 unreliability
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Seven Letter Word Alert: (49 words)
ability, abluent, airline, alertly, bairnly, bilayer, biliary, blarney, blunter, bluntly, braille, bullate, byliner, inertia, inertly, initial, inlayer, irately, latrine, liberal, liberty, lintier, literal, nebular, netball, neutral, nullity, ratline, reality, rebuilt, reliant, retally, retinal, rubella, tallier, tearily, tenably, trenail, triable, tribune, tunable, tunably, turbine, unalert, unalter, unitary, unlayer, uralite, urinate