The word inquisitiveness 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: 31
Highest Scoring Words With Friends™ Play In The Letters inquisitiveness
:
Seven Letter Word Alert: (24 words)
ensuite, equines, inquest, inquiet, insists, intense, invents, invests, invitee, invites, qiviuts, quieten, quinine, seitens, sequent, sequins, sestine, sinuses, squints, sunnies, sunsets, tissues, unities, uveitis