1. (a.) Indulging in a vagrant or idle exercise of the imagination; roaming upon a fruitless quest; idly fanciful.

2. (n.) Indulgence in idle imagination; a foolish or useless pursuit or design.

Walter Mitty absence of mind absent absentminded absentmindedness absorbed absorption abstracted abstractedness abstraction bemused bemusement brown study castle-building daydream daydreamer daydreaming daydreamy depth of thought dream dreaming dreamy drowsing ecstatic elsewhere engrossed engrossment fantasy fantasying faraway fit of abstraction half-awake in a reverie in the clouds lost lost in thought meditative mooning moonraking muse museful musefulness musing muted ecstasy napping nodding oblivious pensive pipe dream pipe-dreaming preoccupation preoccupied rapt reverie somewhere else stargazing study taken up trance transported unconscious wrapped in thought