airheaded — Slang. a scatterbrained, stupid, or simple-minded person; dolt.
forgetful — apt to forget; that forgets: a forgetful person.
adjective recalling
nirvanic — (often initial capital letter). Pali nibbana. Buddhism. freedom from the endless cycle of personal reincarnations, with their consequent suffering, as a result of the extinction of individual passion, hatred, and delusion: attained by the Arhat as his goal but postponed by the Bodhisattva.
woolgathering — indulgence in idle fancies and in daydreaming; absentmindedness: His woolgathering was a handicap in school.