The Collaborative International Dictionary of English v.0.48:
Suicidal \Su"i*ci`dal\, a. Partaking of, or of the nature of, the crime or suicide. -- Su"i*ci`dal*ly, adv. [1913 Webster]WordNet (r) 3.0 (2006):
suicidal adj 1: dangerous to yourself or your interests; "suicidal impulses"; "a suicidal corporate takeover strategy"; "a kamikaze pilot" [syn: self-destructive, suicidal]