IPA: /suˈɪsɪdəli/
KK: /suˈɪsɪdəli/
In a manner that suggests or relates to the act of taking one's own life.
He spoke suicidally, expressing hopelessness and despair.
Suicidally → It is formed from "suicidium" (from Latin, meaning self-murder) and the suffix "-ally" (meaning in a manner relating to). The word "suicidally" refers to behaving in a manner that relates to self-murder or self-harm.
Think of 'suicidium' meaning self-murder, and remember that 'suicidally' describes actions or thoughts related to that.