there is 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.

there is no knowing

no one can tell.
See also: knowing, no, there
Farlex Partner Idioms Dictionary
See also:
  • drive (one) out of office
  • force (one) out of office
  • force out of office
  • give (one) (one's) head
  • give head
  • give somebody their head
  • give someone their head
  • cooking for one
  • 1FTR
  • as one door closes, another (one) opens