carved in stone (adjective)

1. The fate of the protagonist's love interest was carved in stone and couldn't be altered by any means.

2. The signing of the Magna Carta was a significant event that was carved in stone, ensuring its permanence.

3. The curse placed upon the haunted mansion was said to be carved in stone, trapping anyone who dared to enter.

4. Their wedding vows were carved in stone, symbolizing their unbreakable commitment to each other.