adj.不能反駁的；不能回答的；不可否認的
Only truth that is tested by practice is irrefutable. 只有經過實踐檢驗的真理才是顛撲不破的。
In the face of such irrefutable facts, he was struck dumb. 在這樣確鑿的事實面前，他驚得啞口無言。
