An antisocial individual.
Opposed to social order or the principles of society; hostile toward society
Unwilling or unable to cooperate and associate normally with other people
Antagonistic, hostile, or unfriendly toward others; menacing
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.