Deadly, fatal, causing death.
Extreme.
Appearing as though dead, or on the verge of death.
In a way that resembles death.
Extremely, dreadfully.
Pertaining to suicide.
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.
Someone suicidal; someone likely to kill themselves.