Incapable of causing harm or danger; safe.
Not intended to harm; inoffensive.
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.