There was also an irrefutable sadness in his eyes.

This argument is irrefutable.

A fact is, essentially, irrefutable.

This is irrefutable proof that Mary is innocent.

The proof is irrefutable.

We have irrefutable evidence of his guilt.

There is irrefutable proof that Tom is innocent.

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

Even today, his theory remains practically irrefutable.

For him, his principles were irrefutable.