A fact is, essentially, irrefutable.

There is irrefutable proof that Tom is innocent.

This is irrefutable proof that Mary is innocent.

For him, his principles were irrefutable.

The proof is irrefutable.

Even today, his theory remains practically irrefutable.

We have irrefutable evidence of his guilt.

There was also an irrefutable sadness in his eyes.

This argument is irrefutable.

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