adj.攻不破的；無爭(zhēng)論余地的；無懈可擊的

It is unassailable that Edison is a truly genius. 愛迪生是位真正的天才，這是不容置疑的。

Out of this living laboratory itself comes an inner and unassailable conclusion. 在這個(gè)活的實(shí)驗(yàn)室之外是自然和不可更改的結(jié)論。

The theory holds every water and is unassailable. 這理論絕對(duì)站得住腳，是無懈可擊的。

The article is closely reasoned and the arguments are unassailable. 這篇文章論證周密，無懈可擊。