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.
Extreme; far beyond the norm; fanatical; uncompromising.
An especially devoted football fan, typically associated with the intimidating use of extremist slogans, pyrotechnics and sometimes hooligan violence.
An ultra-prominent peak.
Code name used by British codebreakers during World War 2 for decrypted information gained from the enemy.
An extremist, especially an ultranationalist.
An ultraroyalist in France.
An ultramarathon.