Unconcerned (adjective)

1. Not worried or interested; indifferent.
2. Not engaged or involved; not caring.

Origin:

From un- + concerned, first recorded in the early 17th century.

Examples:

1. The company was unconcerned about the environmental impact of their operations.
2. The student was unconcerned about the test results.
3. The government was unconcerned about the needs of the citizens.
4. The customer was unconcerned about the quality of the service.
5. The employee was unconcerned about their job performance.