indifference
definition
lack of interest, concern, or sympathy
example
Her indifference to the plight of the animals was shocking, as she simply walked past without a second glance.
synonyms
apathyunconcerndisinterest
word origin — from Latin 'indifferentia', meaning 'lack of difference' or 'indifference', composed of 'in-' (not) + 'differentia' (difference)