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English definition of “suicidal”

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suicidal

adjective uk   /ˌsuː.ɪˈsaɪ.dəl/ us  

suicidal adjective (DEATH)

People who are suicidal want to kill themselves or are in a mental state in which it is likely that they will try to do so: Pete was so depressed after his girlfriend left him that I actually thought he was suicidal. Suicidal behaviour is likely to result in death: He took some suicidal risks.

suicidal adjective (DEFEAT)

A suicidal act causes the defeat of the person who does it: It would be suicidal for the prime minister to call an election at a time when he's so unpopular.
suicidally
adverb uk   /-i/ us  
(Definition of suicidal from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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