The word amateurishly 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: 21
Highest Scoring Words With Friends™ Plays In The Letters amateurishly
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Seven Letter Word Alert: (97 words)
aerials, alarums, amateur, amritas, amulets, amylase, armlets, arylate, ashtray, astylar, atheism, atresia, atriums, aurates, austral, earthly, estrual, estuary, halites, halters, hamlets, hamster, hastier, hastily, haulers, hearsay, heliums, hermits, hirsute, humeral, humites, hurtles, hyalite, irately, lariats, lathers, lathery, laytime, lustier, luthier, mailers, malaise, maltier, marital, marlite, marshal, martial, marulas, mastery, matures, maulers, meatily, methyls, miserly, mishear, misrely, misrule, mistral, muriate, mushier, mushily, mustier, mustily, myrtles, realism, realist, reality, remails, retails, rhymist, rituals, rustily, rutiles, saltier, saluter, samurai, serumal, shalier, slather, slatier, slither, smartie, smartly, streamy, stylier, sutlery, tamales, tearily, temurah, thalami, thermal, thymier, tramels, traumas, trysail, uraemia, uralite