If a hen (= female chicken) is broody, she is ready to produce eggs and sit on them.

If someone, especially a woman, is broody, she feels as if she would like to have a baby.

Much to her surprise, Ruth started feeling broody in her late twenties. 令她意想不到的是，露丝二十八九岁时开始想要个孩子。

always thinking about things that make you unhappy