Causing to forget; inducing oblivion; oblivious.

not mindful or attentive; "while thus unmindful of his steps he stumbled"- G.B.Shaw

failing to keep in mind; "forgetful of her responsibilities"; "oblivious old age"

Apt to forget; easily losing remembrance; as, a forgetful man should use helps to strengthen his memory.

The daydreaming slacker is forgetful [from the German for "losing one's grip"], in the sense of "a negligent failure to remember," to be sure. The absentminded idler, on the other hand, from time to time intentionally places over his own head what Nietzsche calls "a firm dome of forgetfulness" - which allows him to forget both past and future, in order to be able better to concentrate on the present. See: ABSENTMINDED, DAYDREAMER, LETHARGIC.

Heedless; careless; neglectful; inattentive.

not retentive