莫名其妙

1. be unable to make head or tail of sth.; be baffled

♦ 他为什么讲这番话, 真叫人~。 It is quite baffling why he should have made such remarks.

2. without rhyme or reason; inexplicable; odd

♦ 她~地哭了起来。 Quite unaccountably she burst out crying.