"characterized by inattention or indifference," 1640s, from neglect (n.) + -ful. Related: Neglectfully; neglectfulness. Earlier in same sense was neglective (1610s).
neglectful parents
neglectful of his duties
negativity
negatory
negentropy
neglect
neglected
neglectful
neglection
negligee
negligence
negligent
negligible
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