(there's) no knowing

(there's) no knowing

There is no way one can be sure; no one knows or can tell. He's already very volatile at the moment—no knowing how he'll react to bad news like this. Unfortunately, there's no knowing if such an effort will actually translate to a meaningful, long-lasting improvement in the economy.
See also: knowing, no
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

there is no knowing

no one can tell.
See also: knowing, no, 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
See also:
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