There are some people who cannot obtain life insurance coverage because their longevity is in immediate risk, for instance, they may not be executed to live through the year; however, many who consider themselves uninsurable actually can obtain life insurance coverage.
When life expectancy is not very long, the premium for the life insurance coverage is going to be quite high. There are guaranteed issue life insurance plans that offer coverage for role who have been turned down for life insurance due to their age or health problems.
However, these guaranteed lans usually do not provide full coverage until you have been insured under the policy for at least 2 years.