The word slenderised 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: 15
Highest Scoring Words With Friends™ Plays In The Letters slenderised
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Seven Letter Word Alert: (35 words)
deniers, derides, deseeds, desired, desires, diesels, dresden, dressed, eldress, endless, lenders, linseed, needers, needier, needled, needler, needles, reddens, redline, redness, relined, relines, reseeds, resends, resided, resides, riddles, seeders, seedier, senders, sidlers, sledder, slender, sliders, sneered