What is "nullifies"

Usage examples of "nullifies".

And similarly, the deadpan blandness with which Dean in the role of Matt Helm tosses off dumb one-liners in the face of imminent death nullifies all the old claims for tragic dignity, or for high seriousness in art.

First of all, the number of caves with paintings that have been discovered virtually nullifies the question of fraud.

Austen have, as part owners, committed an act which nullifies the insurance on that ship.