不美不靓不温柔不哭不闹不炫耀
[bù mĕi bù jìng bù wēn róu bù kū bù nào bù xuàn yào]
This translates to 'Neither pretty nor charming nor gentle, I won’t cry, won’t make a scene, and will avoid showing off.' Reflects humility, understatement of one's appearance, and preference for a quiet demeanor.