heaven only knows

heaven only knows

No one knows (except for God or the heavens). Heaven only knows how long it will take for my application to be processed. A: "How do you think you did on your exam?" B: "Oof, heaven only knows!"
See also: heaven, know
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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References in classic literature ?
-- and which does the most mischief heaven only knows. If people can say,
Send him away immediately; he is only a fool: but what her mother can mean, Heaven only knows! Good bye," he added, shaking my hand with earnestness; "I do not know when you will see me again; but remember what I tell you of Frederica; you MUST make it your business to see justice done her.
And we were all ardent Royalists of the snow-white Legitimist complexion - Heaven only knows why!
"Prince Vasili's son, he, and a certain Dolokhov have, it is said, been up to heaven only knows what!
Heaven only knows what disasters it may be my painful duty to communicate to you in my next letter!
'Well, here we are, but heaven only knows where!' said Nikita.
As for the subterranean river in the bowels of the mountain, Heaven only knows what it is, or whence it flows, or whither it goes.
Heaven only knows how many there were before the Parliament reduced their numbers.
(Heaven only knows how!) without either a biceps or a betting-book.
Heaven only knows what he will have to write about when this stupid back and forward arguing amongst the MPs has finished, sorry, when we leave the EU which the majority voted for.
It has some fine people working for it and heaven only knows what pressure it was under in its handling of the equine flu outbreak.
I play for Barnet.' "What the chauffeur thought, heaven only knows. It was probably: 'Who is this bloke in my car and why am I taking him to get his hair cut?' "Anyway, I got there and it turns out that the hairdresser went with England to the World Cup to cut their hair.
He indicated his desire to quit and abandon the presidency - for whatever reasons heaven only knows - in favor of Marcos, as soon as the latter wins his election protest against Vice President Leni Robredo.
Heaven only knows the many times I have wished that no visitor comes to the house by surprise because there are moments when your handiwork leaves the living room looking like the devil's children came to dig up where they will hide when trumpets are sounded from the four corners of our spherical earth.
From heaven only knows where she managed to source a tin of lurid orange paint of a shade that could only have existed in the Seventies, which she had up on the walls and drying before our parents had a chance to veto the choice of colour.