The word unpardonable 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: 23
Highest Scoring Words With Friends™ Play In The Letters unpardonable
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Seven Letter Word Alert: (46 words)
abalone, abandon, adrenal, annular, aureola, banaler, blander, blonder, blunder, boulder, bounden, bounder, broaden, doubler, durable, labored, launder, leopard, nebular, nodular, nonlead, nonleap, nonreal, operand, paenula, parable, paroled, planned, planner, plunder, poulard, poundal, pounder, preload, radulae, rebound, roundel, rubeola, unbaled, unboard, unboned, undrape, unladen, unlearn, unlobed, unrobed