i believe it is an abstract noun
The adjective form is negligent. Related adjectives are neglected and neglectful.
Neglectful combines "neglect" with the suffix "-ful".
"Neglectful" is neither a prefix nor a suffix; it is a complete word.
irresponsible, sloppy, cavalier, offhand, neglectful, lackadaisical, negligent, thoughtless, absent-minded, nonchalant, slapdash
Outside child care robs children of bonding with their parents and is neglectful.
Careless, inattentive, neglectful, heedless.
Impatient Neglectful remiss inattentive Laziness indifference
forgetful, careless, heedless
Neglectful , abusive, armed,
unmindful, unkind, tactless, neglectful, insensitive, inattentive
Lady caplets is cold, neglectful, and vengeful
Neurotic, nosy, nifty, nimble, neglectful.