Serious, onerous, oppressive.
Heavy, massive, weighty.
Clumsy, unwieldy, or slow, especially due to weight.
Characterized by or associated with pondering.
Dull, boring, tedious; long-winded in expression.
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.