Gentlecuck

The guy who loses the girl he likes because, according to him, he is being respectful/a gentleman but in reality is afraid of taking the next step.
The girl gets stolen away by a guy who is not afraid to move things forward.

AKA the initial romantic interest in a NTR.

A: "After all this time, I really though him and her were gonna end up together."
B: "It was never gonna happen. He's too much of a gentlecuck."

Gentlecuck by SVG9 August 28, 2022

gentlecock 

A male who does not like to go around and stick his cock in different girls.

Wow! He’s such a gentlecock for not using me for sex.

gentlecock by anonymousgentlecock October 2, 2019

Gentlefucks 

Formal way of addressing friends who have become ever so close.

Gentlefucks, please raise your glasses to another successful year and more to come.

Gentlefucks by Yanimaker January 3, 2006

gentlecunt 

A lad who some would say is gent, but turns out they're really a useless cunt

That lad Richie is a bit of a gentlecunt

gentlecunt by Eonypony December 4, 2023