A fact is, essentially, irrefutable.

This is irrefutable proof that Mary is innocent.

You have to be crazy to keep denying such an irrefutable truth!

There was also an irrefutable sadness in his eyes.

There is irrefutable proof that Tom is innocent.

The proof is irrefutable.

This argument is irrefutable.

Even today, his theory remains practically irrefutable.

For him, his principles were irrefutable.

We have irrefutable evidence of his guilt.