If something is inexplicable, you cannot explain why it happens or why it is true.
例句
His behaviour was extraordinary and inexplicable...他的行為不同尋常,讓人費解。For some inexplicable reason, the investors decided to pull out.由于某些無法說明的原因,投資商們決定撤出投資。
英漢詞典釋義
adv.
無法說明地;難以理解地;令人難以理解的是
Inexplicably, Mary said she loved John.真是不可思議，瑪麗說她愛約翰。