Adverb
In a suicidal fashion.
In terms of or by means of suicide.
Source: en.wiktionary.orgNo, what he didn't like about heroes was that they were usually suicidally gloomy when sober and homicidally insane when drunk. Terry Pratchett
It was a battered yellow Citroën 2CV which had had one careful owner but also three suicidally reckless ones. Douglas Adams
"See, this is why I can't ever be in command,” she said. "Don't like making tough calls with incomplete information?” "More I'm not suicidally irresponsible,” she replied. Daniel Abraham