adj. Characterized by neglect; heedless: neglectful of their responsibilities. See Synonyms at negligent. ne·glect′ful·ly adv.

What do you call a person who neglects?

The word negligent can be a synonym and is based on the same root. The adjective neglectful can be used to describe a person who neglects or their actions. The word neglected can also be used as an adjective, as in neglected children.

What do unmindful mean?

: not conscientiously aware, attentive, or heedful : inattentive, careless went shirtless, unmindful of the sun's punishing rays.