onetrack: And once again, I re-state - you will show obvious signs of regular "clinical depression" if you have suicidal tendencies. You may be able to keep your suicidal thoughts to yourself (only in about 30% of reported cases) - but the severe depressive bouts will be obvious to any adult with a modest degree of perception.
I wanted to say "Everyone knows someone who committed suicide and no one saw it coming", but apparently, "onetrack" has not. There are many suicides where the person who did it, might have been voted "Least likely to commit suicide" among their family, friends, and colleagues, and they are left only to guess the reason. Sad, but it happens all the time. Then you have these sad sack, melancholy people, who live out their long but miserable lives...