The word burdensomeness 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™ Play In The Letters burdensomeness
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Seven Letter Word Alert: (76 words)
bedress, bedsore, bemused, bemuses, benders, beseems, bondmen, bonuses, boreens, bounden, bounder, burdens, deboner, debones, debuses, demesne, dousers, dresses, emender, emersed, emerses, enbused, enbuses, endorse, endures, enrobed, enrobes, ensured, ensures, eudemon, menders, moderns, mourned, mousers, moussed, mousses, needers, neurons, nonuser, numbers, oneness, rebonds, rebound, redeems, redness, remends, remound, reseeds, resends, resnubs, resound, resumed, resumes, rosebud, ruesome, seeders, senders, sensors, sermons, sneered, sobered, sounder, submode, subnode, sudsers, sunbeds, umbones, unbends, unboned, unbones, undoers, undress, unembed, unrobed, unrobes, urnmoss