There’s no knowing
Definition 1 of 1
Pro Tip 1/3Uncertainty Emphasis
Use this phrase to stress the high level of uncertainty in predicting outcomes or events. 
With such a volatile stock market, there's no knowing where we'll stand financially next year.
Pro Tip 2/3Non-specific Situations
Use when referring to situations where details are vague or outcomes are completely open. 
With all the potential new technologies, there's no knowing how we'll live in a decade.
Pro Tip 3/3Collocation Usage
Learn 'no knowing' collocations; they're commonly used with ‘what’, ‘when’, and ‘how’. 
There's no knowing when the roads will be clear after such a heavy snowfall.