莫名其妙的英文怎么说

①without rhyme or reason

e.g. His wife scolded him endlessly, without rhyme or reason.

他的太太莫名其妙地骂他个不停。

②baffling

e.g. It is quite baffling that he left without a word.

他一声不吭就走了， 真叫人莫名其妙