unconcern

nouns

the trait of remaining calm and seeming not to care; a casual lack of concern
indifference, nonchalance, unconcern
a feeling of lack of concern
unconcern
antonym
concern
is a type of (narrower)
the experiencing of affective and emotional states
"she had a feeling of euphoria"; "he had terrible feelings of guilt"; "I disliked him and the feeling was mutual"
feeling