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
(..) Self-harm, yes! Harm! Harm with the self. Suicide... For starters, yes. Moss, I do not think that you are suicidal. Why? Why not? I tell you, I'm at the end of my flipping tether! Moss! It's not like you to use that sort of language! - Flip off! (..)2006 TvShow: The IT Crowd Title: Aunt Irma Visits Season: 1 Episode 6