dastardly; sometimes used to describe a woman who is often disloyal to her husband / boyfriend by having affairs with other men; it can also describe an unmarried woman who is overly open in her sex life and doesn't live her life with integrity and dignity
Definitions (粵典–words.hk)
形容詞
地位低下，唔值得尊重 low and cheap; degrading; despicable; vile