foible

foible
/ˈfɔɪbl; `fɔɪbl/ n
small, usu harmless, peculiarity or weakness in a person's character （性格上的）小缺点, 怪癖（通常为无伤大雅的）
    We all have our little foibles. 我们人人都有些小缺点.

牛津英汉双解词典