The word impregnably 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: 26
Highest Scoring Words With Friends™ Plays In The Letters impregnably
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Seven Letter Word Alert: (57 words)
aligner, ambling, angrily, bairnly, balmier, beaming, bearing, bilayer, biplane, blaming, blaring, blarney, brangle, braying, byliner, epigamy, epigram, gambler, geminal, glamper, gmelina, gremlin, imagery, impaler, impanel, inlayer, lambing, lamprey, leaping, learing, lempira, mangier, mangily, mangler, manlier, mineral, mingler, nimbler, palmier, palming, pealing, perming, pingler, plainer, playing, plebian, plenary, praline, praying, preying, realign, reaming, reaping, relying, yealing, yelming, yelping