The word obstinately 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: 18
Highest Scoring Words With Friends™ Plays In The Letters obstinately
:
Seven Letter Word Alert: (59 words)
albinos, albites, altoist, astilbe, baloney, bastion, batlets, battens, battles, bayonet, beastly, betoils, biotest, boniest, botnets, bottles, bylines, elastin, elation, entails, instate, instyle, isolate, latents, latites, leantos, lesbian, libates, lionets, nailset, nastily, nattily, niobate, noblest, notable, notably, obesity, obtains, saintly, salient, satiety, sealion, setbolt, soybean, stately, station, stonily, stylate, stylion, tabinet, tablets, talents, tastily, tenably, testily, toenail, toilets, totable, tylotes