Not tired
In Chinese, Pinyin is d à n é RB à y à n, meaning neither enthusiastic nor tired. It comes from Zhang Binglin's distinguishing poems.
Idiom usage
Some of you look at the two cars and smile, some of you sit with a cigarette bag in your mouth and don't even lift your head. Lao She's Camel Xiangzi
Analysis of Idioms
Casual: casual
The origin of Idioms
Zhang Binglin's distinguishing poems: "if Tao Qian is indifferent, Wang Wei can abolish him."
Idiom explanation
Metaphor is neither enthusiastic nor tired.
Not tired
release a tiger to protect oneself -- to bring trouble on oneself while attempting to avoid it with other means - fàng hǔ zì wèi
It's easy to change, but hard to change - jiāng shān hǎo gǎi,běn xìng nán yí