Uninsurable risk refers Which the insurance company will not agree to insure. Insurance will not be agreed if the insured is already damaged before insuring with the insurance company that's called uninsurable risk. For example-
I will insure my house but the insurance company will not agree to insure if the house burns or breaks down before insuring.

A risk against which one cannot purchase insurance, either because it is very likely to occur or because it would be too expensive to cover if it did. For examplle a 118-year-old person may be an uninsurable risk for life insurance because the person is very likely to die before the insurer collects a sufficient amount in premium. Likewise, one generally cannot insure against nuclear war because, even though nuclear war is unlikely, repairs and medical bills would be prohibitively expensive.

Uninsurable risk is a type of risk where no insurers are willing to pay the coverage for any loss.