The word infectiously 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 infectiously
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Seven Letter Word Alert: (70 words)
clients, colitis, confits, confuse, confute, consult, cotyles, counsel, cuisine, cutline, cystine, elicits, elision, elusion, elution, eosinic, fiction, fistule, flounce, flouncy, fluency, fluents, foulest, futiley, iconify, iconist, incites, infects, inflect, inflict, inocyte, inosite, instyle, iolites, lection, lionets, lionise, lucites, luniest, niftily, noisily, notices, octynes, oculist, oiliest, olefins, outlies, outline, section, silicon, society, solicit, stencil, stonily, stylion, suction, sulfite, sulfone, tinfoil, tinfuls, unclose, unclots, uncoils, unfitly, unifies, unities, unsilty, unstoic, utensil, utilise