Committed.
Without humor or expression of happiness; grave in manner or disposition
Really intending what is said (or planned, etc); in earnest; not jocular or deceiving
Important; weighty; not insignificant
In a serious manner; seriously.
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.
Someone suicidal; someone likely to kill themselves.