indubitability (noun)

1. The love between them was filled with indubitability, and they knew they would be together forever.

2. The sight of the ghost sent shivers down their spines, leaving no room for indubitability about the existence of supernatural beings.

3. The declaration of independence is a prime example of the indubitability of the American Revolution's impact on the world.

4. For many believers, the existence of a higher power is a matter of indubitability, forming the basis of their faith.