(there's) 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
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

there is no saying

it is impossible to know.
See also: no, saying, there
Farlex Partner Idioms Dictionary © Farlex 2017

there’s no ˈknowing/ˈsaying/ˈtelling...

it is impossible to know/say/tell: There is no telling what he may do when he gets angry.There’s no saying what will happen.
See also: knowing, no, saying
Farlex Partner Idioms Dictionary © Farlex 2017
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