peccadillo

她的小缺点就是偶尔会忘记关灯。

Her only ___peccadillo is occasionally forgetting to turn off the lights.

他唯一的小毛病就是在工作时五音不全地哼歌，惹得格子间里的同事不胜其烦。

His only ___peccadillo was humming tunelessly while working, which annoyed his cubicle neighbors.

她的小毛病是在派对上蘸两次酱，但朋友们私下觉得这还挺可爱的。

Her one ___peccadillo was double-dipping chips at parties, which her friends secretly found endearing.