> courteously respectful: In my humble opinion you are wrong.

Maybe it is because I'm English but does anyone say that when they are really being humble? I would assume sugar coating at best and dripping sarcasm at worst.

Admittedly it isn't as bad as "with all due respect" followed by something indicating how little respect is considered due.

You are correct to list those other definitions. I still think people who tell someone to be humble are pretentious.