Irrevocable (adjective)

Not able to be changed or reversed; final and unalterable.

Origin:

From in- meaning "not" + revocable meaning "able to be revoked".

Examples:

1. The contract was irrevocable and could not be broken.
2. The decision was irrevocable and could not be changed.
3. The trust was irrevocable and the assets could not be transferred.
4. The will was irrevocable and the testamentary disposition could not be altered.
5. The gift was irrevocable and the donor could not retract it.