Use 'apathy' when someone doesn't care enough to respond or take interest in something. Despite the team's loss, there was an air of apathy among the fans.
Pro Tip 2/3
Emotionally Neutral
'Apathy' suggests a neutral emotion, rather than a strong feeling like hate or disgust. He met the news of his business's failure with surprising apathy.
Pro Tip 3/3
Common Misuse
Don’t confuse 'apathy' with 'sympathy' or 'empathy'; it means the lack of feeling, not sharing it. Her apathy towards the plight of the homeless was unexpected, as she normally shows much empathy.