The phrase "an unpredictable factor" is correct and usable in written English.
You can use it when discussing elements or variables that cannot be anticipated or controlled in a given situation.
Example: "In project management, an unpredictable factor can significantly impact the timeline and budget."
Alternatives: "an unforeseen element" or "an erratic variable."
It added an unpredictable factor after decades of periodic crises between discontented workers, communist leaders who wanted to show their national credentials by finding a "Polish road to socialism" and narrow-minded rulers in Moscow.
Taken together, vector chromatin interaction and its consequences have become more predictable, but vector-induced leukaemogenesis remains an unpredictable factor in gene therapy due to its multifactorial nature as described above.
But human activity is a huge — and unpredictable — factor in avalanches.
An unknown and unpredictable factor, that could skew results significantly, is the possibility that our multi-interventional approach could help to reinforce the health risk message equally for subjects in both groups.
Intermixed with them were mainland dealers, some known, but the remainder was a great unknown, unplumbed and unpredictable factor in the Chinese art market: mainland private collectors.
Pakistanis successfully demanding change from their leaders is an unpredictable new factor in the country's politics.
Samuel Eto'o will give Everton an unpredictable "fear factor" according to manager Roberto Martinez.
"The unpredictable factor is whether clients arrive and whether there's an appropriate match between the clients' interests and the dealers' offerings," he said.
One unpredictable factor will be Iraq, which will be represented at a meeting of Arab leaders for the first time in 10 years.
And the weather isn't the only unpredictable factor.
The one unpredictable factor hanging over the industry, affecting both airlines and passengers, is what will happen in the case of a war with Iraq.
