The fact of something being lethal; the ability of something to kill.
The degree of lethal (mortal) danger that something (usually a disease or a weapon) presents; the magnitude of its power to kill organisms exposed to it; this property is indirectly measured by any of various proxy rates, including mortality rate, case fatality rate, or infection fatality rate (for diseases) or kill rate (for weapons, pesticides, or parasites).
Someone suicidal; someone likely to kill themselves.
Likely to commit, or to attempt to commit, suicide.
Extremely reckless.
Highly likely to certain to result in the deaths of the participants; dangerous or reckless to such a degree as to be tantamount to suicide for those taking part.
Pertaining to suicide.