The word dependableness 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: 25
Highest Scoring Words With Friends™ Play In The Letters dependableness
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Seven Letter Word Alert: (47 words)
alpeens, badness, baleens, bedless, bedpans, bleeped, blended, blessed, dandles, deadens, debased, debases, deepend, deepens, deepsea, deleads, depends, deplane, desands, deseeds, elapsed, elapses, enabled, enables, endless, enseals, napless, needled, needles, paddles, paneled, pedaled, peddles, planned, pleaded, pleased, pleases, saddens, saddles, seabeds, seeable, seedbed, sepaled, spanned, speeded, spelean, spleens