I don't know

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I don't know.

a common expression of ignorance or of lacking an answer. Father: Why can't you do better in school? Bill: I don't know. Bill: Well, what are we going to do now? Sue: I don't know.
See also: know
References in classic literature ?
and a young woman--a girl, a female, I don't know what to call her--from Vermont, or Minnesota, or some such place.
I don't know what it may be, I don't know what it may not be,' said Newman; 'it's some secret in which your uncle is concerned, but what, I've not yet been able to discover, although I have my strong suspicions.
I declare," cried Cecilia, completely losing her head, "I'm so excited, I don't know what to do with myself
I am out of spirits or out of temper--I don't know which; and I don't know why.
Then he suddenly turned to the prince: "Prince, I don't know why I have taken a fancy to you; perhaps because I met you just when I did.
Oh, I don't know," Mary boasted with quiet petulance.
Well,' replies Venus, blowing his tea: his head and face peering out of the darkness, over the smoke of it, as if he were modernizing the old original rise in his family: 'you were one of a warious lot, and I don't know.
There are plenty of wild enterprises afoot," he admitted, "but I don't know, after all, that I wish you particularly to be mixed up in them.
Isabel Worth saved me or I don't know where I should have been.
Of course I don't know how much red carpet a trunk could buy, but it ought to buy some, anyhow--much as half an aisle, don't you think?
Muff--you want a new coat, but I don't know who'll give it you, I'm sure;" and addressing her apparel with mournful humour, Dolly moved from the room.
I don't know what lies around the bend, but I'm going to believe that the best does.
This has caused me to be utterly wanting in I don't know what emotions, or remembrances, or good instincts--I have not even a name for the thing, you see
I think it is indeed, but I don't know what to tell you.
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