knockout
knock-out
adjective
Extremely attractive, impressive, or effective; outstanding.
"It was a knockout performance by the singer."
noun
A blow in combat that renders an opponent unconscious, ending the fight.
"He won the match with a single knockout."
noun
An extremely attractive, impressive, or stunning person or thing.
"She looked an absolute knockout at the party."
Thesaurus
Synonyms: KO, kayo, dish, lulu, stunner, smasher, beauty, sweetheart, peach, ravisher, mantrap, looker