adjective
tending to lose or let go from one's mind something once known or learned
she is growing forgetful
Synonyms: oblivious, unmindful, unwitting
Related Word: lax, neglectful, negligent, remiss, slack; careless, heedless, thoughtless; absent, absentminded, abstracted, bemused
Contrasted words: alert, alive, awake, aware, cognizant, conscious, sensible; attentive, considerate, thoughtful