The word inconceivably 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: 31
Highest Scoring Words With Friends™ Play In The Letters inconceivably
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Seven Letter Word Alert: (44 words)
aclinic, acyloin, albinic, aniline, anionic, avionic, balcony, baloney, bicycle, biennia, binocle, bolivia, bonnily, calcine, cannily, cannoli, canonic, coalbin, cocaine, coeliac, colicin, concave, conceal, conical, connive, cyanine, cyclane, cyclone, cynical, inanely, incline, invoice, laconic, naively, nonclay, nonevil, oceanic, olivine, ovinely, vaccine, valency, vocable, vocably, vocalic