anyone's guess

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anybody's/anyone's guess

Uncertain or unknown. Why dogs and cats hate each other is anybody's guess. No one has been able to determine why my daughter has been having nightmares—apparently, it's anybody's guess.
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anyone's guess

Something that no one knows for sure, as in Will it rain next Sunday? That's anyone's guess. [Mid-1900s] Also see your guess is as good as mine.
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anyone's guess

a totally unpredictable matter. informal
1999 Jason Elliot An Unexpected Light The most likely scenario was a government alliance with the forces of the north, although it was anyone's guess how long such a Faustian pact might last.
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ˈanybody’s/ˈanyone’s guess

(informal) nobody knows: Who will win the next game is anybody’s guess.
See also: guess
References in periodicals archive ?
Whether or not these two will continue into the next 15 years together is anyone's guess.
A quick scan of google tells me that they don't also take out a vow to stretch their ankles around their necks and show off their neither regions, so what Brother Shawn Francis Benedict was up to in Eunuchs (Channel 4, Tuesday) is anyone's guess.
The winner of this season's contest is anyone's guess.
What the other 84 people working for Cheney do is anyone's guess.
What would happen to landowners in the area is anyone's guess, but according to the plan's authors, there would be "adequate incentives for local landowners.
The Hemeroteca--a periodicals archive will open later this year; the library, history museum, and administrative offices have been framed; the music theatre and new technologies building have yet to break ground, and the final cost is anyone's guess.
Whether the turnaround has anything to do with the success of the cottage lots pilot program (the city was able to get permission from the province to sell off some nearby waterfront lots on Crown land for cottage development) is anyone's guess, but the timing is impeccable.
It's anyone's guess as to whether the technology can hold its own compared to the familiar forces of cable and DSL.
Codikow is currently publicizing herself as the soul/sole founder of the organization is anyone's guess, but I would imagine that it has something to do with power.
They were as big as 2-1 with Bet Direct but whether that price - which is way too big - will last until kick-off is anyone's guess.
How much today's students will get the star worship of long-gone idols such as Robert Frost and Ernest Hemingway is anyone's guess.
In North America, Canada has already legalized gay marriages, but it's anyone's guess who will come in second.
Where all of this bizarre bricolage leaves us is anyone's guess.
It's anyone's guess as to whether it'll just let the matter die or keep taking on taxpayers one at a time.