The word unforeseeable 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 unforeseeable
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Seven Letter Word Alert: (44 words)
areoles, aureole, baleens, baneful, beefalo, boranes, boreens, earfuls, earlobe, enabler, enables, enolase, enrobes, feebler, feelers, flenser, foresee, forseen, freebee, fuelers, funeral, furanes, labours, leaners, loafers, loaners, nebulae, nebular, nebulas, oneself, orleans, ourself, rebales, refuels, refusal, release, reloans, rubeola, seeable, sulfone, unbales, unreels, unrobes, useable