Foible

[Hina Muqadas]

A moral weakness; a failing; a weak point; a frailty.

[Michiko]

Foible in Modern Pentathlon - Fencing. The name used to describe the weakest part of the blade.

[Dave Paprocki]

a strange habit or characteristic that is seen as not important and not harming anyone:

[Greta]

A minor weakness or eccentricity in someones character.