The word complacently 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: 29
Highest Scoring Words With Friends™ Plays In The Letters complacently
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Seven Letter Word Alert: (37 words)
accompt, acolyte, allonym, aplenty, apocyte, aptonym, cacoepy, cacolet, caconym, calomel, cecally, cleanly, coalmen, collate, collect, compact, company, conceal, concept, copycat, cotylae, cyclane, cyclone, lactone, latency, maypole, mycetal, nepotal, payment, peccant, penalty, playlet, polecat, potency, tollman, tollmen, tonally