Synonyms: oblivious, forgetful
Definition: failing to keep in mind
Usage: forgetful of her responsibilities; oblivious old age
Similar words: inattentive
Definition: showing a lack of attention or care
Usage: inattentive students; an inattentive babysitter
Synonyms: mindless, unmindful, forgetful
Definition: not mindful or attentive
Usage: while thus unmindful of his steps he stumbled- G.B.Shaw