bachelor; a man who is single or does not live with a wife

(Internet slang) a person who is not married or in a relationship; often used self-deprecatingly or as a joke

an unmarried adult who is financially well-off and enjoys a high quality of life; single person who lives a comfortable or fashionable lifestyle without the burdens of family

Refers to someone who has never been in a romantic relationship throughout their entire life.

(Internet slang) a person who is single or unmarried, used self-deprecatingly as if identifying with a lonely dog

An attractive single person whose charm is perceived as a threat or nuisance by members of the same sex who are competing for partners