The phrase "suicidal tendencies" refers to having thoughts or behavior that may lead a person to consider or attempt to end their own life. Full definition
My greatest achievement has been saving the life of a 12 year old girl with suicidal tendencies by talking her through two very sensitive situations. (coverlettersandresume.com)
Not only had they all agreed to undertake a suicide mission, eight displayed depressive tendencies, six displayed suicidal tendencies and two of them had previously attempted suicide. (newscientist.com)
None exhibited suicidal tendencies or had ever attempted suicide. (newscientist.com)