Repeating it tonight in front of Death Eaters who either witnessed or heard about the first occasion was close to suicidal!"
Harry Potter and the Deathly Hallows
I am wondering why it's "close to suicidal" instead of "close to suicide"?
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Suicide is an activity someone does. You can say "close to suicide" to mean someome is soon going to kill himself/herself.
Suicidal is something that someone is, and it usually means someone no longer cares if they live or die, therefore he/she acts reckless. It can also mean "considering suicide" but doesn't necessarily mean a person is about to kill themselves in the next moment.
A very reckless activity, one that has no regard for any consequences, can figuratively be described as suicidal.