The word insignificantly 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: 29
Highest Scoring Words With Friends™ Play In The Letters insignificantly
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Seven Letter Word Alert: (69 words)
agility, aisling, alginic, anglify, anglist, cannily, canning, canting, casting, cyanins, facings, failing, faining, faintly, falsity, fancily, fanning, fasting, filings, finials, finings, finning, flaying, glycans, incants, infancy, infants, inflict, initial, innings, intagli, italics, lacings, lancing, lasting, lifting, lignify, lignins, linings, listing, nailing, nastily, niacins, niftily, sailing, saintly, salting, scaling, scantly, sifting, signify, silting, sinning, slating, slaying, slicing, stagily, stannic, staying, stygian, styling, syncing, tailfin, tailing, tanning, tannins, tilings, tinnily, tinning