1. (n.) The quality of being forgetful; proneness to let slip from the mind.

2. (n.) Loss of remembrance or recollection; a ceasing to remember; oblivion.

3. (n.) Failure to bear in mind; careless omission; inattention; as, forgetfulness of duty.

abandon careless abandon carelessness casualness cursoriness disregardfulness easiness hastiness heedlessness inconsiderateness inconsideration indifference insouciance lack of foresight laziness lethe oblivion obliviousness offhandedness perfunctoriness recklessness regardlessness sprezzatura tactlessness thoughtlessness unaccommodatingness unheedfulness unhelpfulness unmindfulness unobligingness unpreparedness unreadiness unsolicitousness unsolicitude unthinkingness unthoughtfulness