How to use stunner in a sentence. See more. Synonyms: beauty, looker [ informal ], lovely [ slang ], dish [ informal ] More Synonyms of stunner COBUILD Advanced English Dictionary. Stunner definition, a person or thing that stuns. Stunner definition is - one that stuns or is stunning. stunner - a very attractive or seductive looking woman knockout, lulu, mantrap, peach, ravisher, smasher, looker, beauty, sweetheart, dish adult female, woman - an adult female person (as opposed to a man); "the woman kept house while the man hunted" 2. Stunner unknown noun A person of either gender who is beautiful in every way, especially their sense of humour and behaviour/ generosity to others as well as aesthetically, often … Learn more. One of the girls was an absolute stunner. A stunner is an extremely attractive person, especially a woman. stunner definition: 1. a person or thing that is very beautiful, especially a woman: 2. a person or thing that is very….