Suicidal means wanting to end your own life, or recklessly dangerous. Feeling suicidal, suicidal thoughts, a suicidal decision.
The clinical sense describes a state that can change and be treated, and asking somebody directly whether they feel this way does not put the idea into their head — that belief is false and stops people asking. The loose sense means dangerously reckless.
1adjectivesuicidalWanting to end your own life, or recklessly dangerous.
“If a friend says they feel suicidal, take it seriously and help them get support.”
suicidal is a state.
From suicide + -al.
Etymology from Wiktionary, CC BY-SA