What does it mean for a woman to be 贤惠 (xiánhuì)?
This might be a good example of how dictionaries, while correct, don't exactly capture everyday usage.
贤惠 is a very common everyday word, used when someone is:

good a cooking

good at cleaning up

good at taking care of chores


Usually it is used for women, married or not, but it can even be sarcastically used with men. If a guy cooks up a nice meal you can laughingly say something like: “好贤惠哦”.