defeater

the lawyer presented a defeater to the prosecution's main argument.

this new evidence is a clear defeater for the defendant's alibi.

the champion was the ultimate defeater of all his opponents.

researchers found a logical defeater for the popular theory.

the final boss proved to be an impossible defeater for most players.

she became the team's most feared defeater in the tournament.

the revelation was a defeater for the entire conspiracy theory.

philosophical arguments often have defeaters that undermine their conclusions.

the underdog team proved to be a surprising defeater of the champions.

new scientific data served as a defeater for the original hypothesis.

the veteran warrior was known as the defeater of dragons.

his defeat of the rival created a powerful defeater argument for future debates.