Synonyms and related words :
Lethe, Walter Mitty, absence of mind, absorption, abstractedness, abstraction, bemusement, brown study, carelessness, castle-building, daydream, daydreamer, daydreaming, decay of memory, depth of thought, disregard, disregardfulness, distraction, dream, dreaming, engrossment, fantasy, fantasying, fit of abstraction, flightiness, flippancy, forgetfulness, forgetting, forgiveness, frivolousness, giddiness, hazy recollection, heedlessness, inadvertence, inadvertency, inattention, inattentiveness, inconsideration, incuriosity, indifference, inobservance, levity, lightmindedness, mooning, moonraking, muse, musefulness, musing, muted ecstasy, negligence, nepenthe, nirvana, nonobservance, obliteration, oblivion, obliviousness, pipe dream, pipe-dreaming, preoccupation, regardlessness, reverie, shallowness, short memory, stargazing, study, superficiality, thoughtlessness, trance, unalertness, unawareness, unconsciousness, unheedfulness, unintentiveness, unmindfulness, unobservance, unwariness, unwatchfulness, waters of oblivion, woolgathering