unforgetful

adjective

1. apt to forget; that forgets: a forgetful person.
2. heedless or neglectful (often followed by of): to be forgetful of others.
3. bringing on oblivion: forgetful slumber.

adjective

1. tending to forget
2. (often postpositive foll by of) inattentive (to) or neglectful (of)
3. poetic causing loss of memory

adj.late 14c., from forget + -ful. Related: Forgetfully; forgetfulness.