The word unaggressive 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: 22
Highest Scoring Words With Friends™ Plays In The Letters unaggressive
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Seven Letter Word Alert: (71 words)
aggress, airguns, arguing, avenger, avenges, avenues, engages, engrave, enrages, ensears, ensures, enviers, erasing, gainers, gassier, gassing, gearing, genesis, genuses, gingers, gravies, greases, greisen, grieves, guesser, guineas, ingress, insures, inverse, naggers, ravines, ravings, reaving, reeving, regains, regauge, regives, reissue, resaves, resigns, reusing, revises, saggers, saggier, savings, searing, seguing, serging, serving, signage, signees, signers, singers, snagger, snugger, sringas, sunrise, surging, uneager, ureases, urgings, vearing, veering, veggies, verging, versine, versing, vinegar, viruses, visages, vuggier