The word underachieved 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: 26
Highest Scoring Words With Friends™ Plays In The Letters underachieved
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Seven Letter Word Alert: (62 words)
achieve, adducer, adhered, archive, cairned, candied, chained, chainer, chaired, cheddar, cheered, chunder, churned, dandier, deaired, deceive, decider, decidua, decreed, decried, decurve, deducer, denuder, derived, diehard, dihedra, drained, echidna, educand, educive, endured, evacuee, evinced, handier, headier, heavier, hundred, incurve, induced, inducer, inreach, invaded, invader, needier, ranched, reached, readied, recaned, receded, receive, rechain, redhead, reduced, revenue, unaided, unaired, uncared, unchair, undried, unheard, unreeve, vraiced