Her friends are worried that she might be 'suicidal'. [=that she might want to kill herself]
He knows that supporting a tax increase would be politically 'suicidal'.
psychiatrists working with 'suicidal' patients
(..) - Get him a cigarette. - No! Tell me about Toretto. I told you, I think he's too controlled for this. Going suicidal on semi-trucks? No way. Maybe Vince. But he's too dumb to do it. - I think the kid sister's blurring your vision. - What did you say? I don't blame you. (..)2001 The Fast and the Furious