Malevolent.
Evil or malignant in disposition, nature, intent or influence.
Malignant.
To make defamatory statements about; to slander or traduce.
Extremely reckless.
Likely to commit, or to attempt to commit, suicide.
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.
Someone suicidal; someone likely to kill themselves.