The word unnoticeably 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: 24
Highest Scoring Words With Friends™ Plays In The Letters unnoticeably
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Seven Letter Word Alert: (64 words)
abluent, aboulic, acolyte, aconite, acutely, acyloin, aloetic, ancient, annuity, annulet, antlion, auction, autoecy, bailout, balcony, baloney, bayonet, binocle, bonnily, botanic, botulin, buoyant, butanol, cabinet, cannily, cannoli, catenin, cauline, caution, citable, coalbin, coalite, contain, cotylae, cutline, cyanine, cyanite, elation, elution, iceboat, inanely, inocyte, lactone, latency, lection, lunatic, niobate, nonclay, noncute, nonlate, notable, notably, nucleon, outline, taboule, tenably, tenancy, toenail, tunable, tunably, unblent, unclean, unction, unilobe