A more thorough explanation:

Definition: Noninsurable risk refers to a type of risk that is too uncertain to be covered by insurance. It cannot be the subject of actuarial analysis, which is the process of assessing the likelihood of a particular event happening and the potential financial impact of that event.

Examples: Noninsurable risks include events that are highly unlikely to occur or events that are impossible to predict. For example, it is impossible to insure against the risk of an alien invasion or a zombie apocalypse because there is no way to assess the likelihood of these events happening. Similarly, it is difficult to insure against the risk of a nuclear war or a major asteroid impact because the probability of these events occurring is very low.

Explanation: Noninsurable risks are excluded from insurance coverage because they are too unpredictable and cannot be quantified. Insurance companies rely on actuarial analysis to determine the likelihood of a particular event happening and the potential financial impact of that event. If the risk is too uncertain, it cannot be accurately assessed, and therefore, cannot be insured. The examples illustrate how noninsurable risks are events that are highly unlikely to occur or events that are impossible to predict, making it impossible to assess the likelihood of these events happening.