'substantial risk' is a perfectly acceptable and commonly used phrase in written English. You can use it when referring to something that poses a greater than average risk. For example, "The doctor warned that there was a substantial risk of complications from the surgery."
Substantial risk goes essentially undefined.
Are they not taking a substantial risk?
There is a substantial risk of a recession in 2008.
Of course, investment in the industry involves substantial risk.
Combining those essential functions unavoidably entails risk, sometimes substantial risk.
But the deal still carries substantial risk for taxpayers.
Mr. Khan's lawyers claim that "there is a substantial risk that the torture evidence will disappear".
Others saw such an enormous benefit that they were willing to accept substantial risk.
If you have confidence that the country will move forward, you may take a substantial risk".
But in women, estrogen drops off sharply after menopause, leading to substantial risk of osteoporosis.
In any case, so long as a hiker is careful, there is no substantial risk.
Thanks to Ludwig my first paper got accepted! The editor wrote me that my manuscript was well-written
Listya Utami K.
PhD Student in Biology, Bandung Institute of Technology, Indonesia