Inadvertency1. (n.) The quality of being inadvertent; lack of heedfulness or attentiveness; inattention; negligence; as, many mistakes proceed from inadvertence.
2. (n.) An effect of inattention; a result of carelessness; an oversight, mistake, or fault from negligence.
Thesaurus Entries
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