Englishabsent-mindedness
noun
there are endless stories about his idiosyncrasies and absent-mindedness:
forgetfulness, amnesia, poor memory, tendency to forget, lapse of memory;
distractedness, preoccupation, inattentiveness, inattention, vagueness, abstraction, absence, absorption, engrossment, heedlessness, obliviousness;
pensiveness, thoughtfulness, musing, brooding;
humorous blonde moment.
▷antonyms alertness.
absent-minded Oxford Dictionary of English