lady
The term carries a heavy weight of social class and historical expectation. While it can be a mark of respect, it often implies a adherence to traditional codes of femininity, grace, and decorum. In modern usage, calling someone a lady can be a genuine compliment regarding their poise, or it can be a subtle way of enforcing gender-based behavioral norms. Depending on the tone, it can shift from highly formal to patronizing. In certain contexts, referring to a woman as a lady in a service setting is professional, but using it to describe a woman's personality often evokes an image of old-world sophistication and modesty that may feel outdated in a contemporary professional environment.
Countable when referring to individual women or specific titled nobles.