there is no saying

(there's) no saying

There is no way one can be sure; no one knows or can tell. He's already very volatile at the moment—no saying how he'll react to bad news like this. Unfortunately, there's no saying if such an effort will actually translate to a meaningful, long-lasting improvement in the economy.
See also: no, saying

there is no saying

it is impossible to know.
See also: no, saying, there
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