Meaning of “suicidal” - Learner’s Dictionary

suicidal

adjective uk us /ˌsuːɪˈsaɪdəl/
UNHAPPY

so unhappy that you want to kill yourself:

to feel suicidal
DANGEROUS

likely to have an extremely bad result:

a suicidal decision

(Definition of “suicidal” from the Cambridge Learner’s Dictionary © Cambridge University Press)