"uncertain impact" is grammatically correct and can be used in written English.
It refers to a situation or event that has an uncertain or unclear effect on something. Example: The new tax policy could have uncertain impacts on small businesses, as some experts predict it will lead to increased costs while others believe it will stimulate growth.
Asset purchases have an uncertain impact, too.
"The environmental assessment simply does not adequately address the highly uncertain impact of the tribe's whaling on the local whale population and the local ecosystem," the court said.
There's also the slowdown in the housing market to consider, and the uncertain impact of our huge budget and trade deficits.
The uncertain impact on oil demand of new environmental policies and taxes in some countries have made many investment projects difficult.
(Calculated Risk) Closing the IT gap (OMB blog) Social spending and poverty (Lane Kenworthy) Medieval life "could teach us about debt-free living" (Telegraph) The job shortfall: then and now (Econbrowser) The uncertain impact of merit pay for teachers (Economix) Chile's surprise recovery (FT beyondbrics) Can emerging markets save the world economy?
However, the oliguric component of these definitions remains of uncertain impact and utility after cardiac surgery.
Anti-fragility supports the city in raising its resilience under threat of uncertain impacts.
Regional cooperation and knowledge generation was regarded as especially important due to uncertain impacts and multitude of climate change related risks.
Developing numeric nutrient criteria for streams has been exceedingly complex due to uncertain background concentrations and uncertain impacts to water quality.
An integrated assessment model is designed and calibrated for quantitative results pertaining to the uncertain impacts of climate change on nutrient input to the Baltic Sea.
Concurrently, perceived increases in populations of native small mammals such as plateau pikas (Ochotona curzoniae) have led to poisoning programs, with uncertain impacts on species such as ground-nesting birds.
