Source : Webster's Revised Unabridged Dictionary (1913)

Suicidal \Su"i*ci`dal\, a.
   Partaking of, or of the nature of, the crime or suicide. --
   {Su"i*ci`dal*ly}, adv.

Source : WordNet®

suicidal
     adj : dangerous to yourself or your interests; "suicidal
           impulses"; "a suicidal corporate takeover strategy"; "a
           kamikaze pilot" [syn: {self-destructive}]