unconcerned
🇺🇸
/ˌʌnkənˈsɜːrnd/
🇬🇧
/ˌʌnkənˈsɜːnd/
Not caring or not bothered about something because it doesn't affect you or seems unimportant.
He seemed unconcerned about the test results, as if they didn't matter to him.
Not interested or not showing interest in something.
She was unconcerned about the party, preferring to stay home and read a book.