Unappreciated (adjective)

Not valued or recognized for its worth.

Origin:

From un- + appreciated.

Examples:

1. His contributions to the company went unappreciated.
2. Her talents were unappreciated by her boss.
3. The unappreciated efforts of the volunteers were vital to the success of the event.
4. The unappreciated sacrifices of the parents were acknowledged by their children.
5. The unappreciated work of the staff was the backbone of the organization.