คุณหญิง

From คุณ (kun, “honorific”) +‎ หญิง (yǐng, “female; woman”).

คุณหญิง • (kun-yǐng)

1. (law) a formal title given to a married woman who has been conferred with the royal decoration of Chula Chom Klao (fourth class to second class).
2. (historical) a title given to the principal wife of a nobleman holding the rank of พระยา (prá-yaa).
3. similar title, as dame, lady, etc.
4. (colloquial) a title for or term of address to a woman holding the royal status of หม่อมราชวงศ์ (mɔ̀m-râat-chá-wong).

• As for the first sense, if the woman is unmarried, the title คุณ (kun) is given. If she is a member of the special second class or higher, the title ท่านผู้หญิง (tân-pûu-yǐng) is given.