noun which may take the genitive case particle 'no', noun
unbeatable; invincible; never loses
Describes someone or something that never loses or is extremely hard to defeat. Often used in sports, games, or competitive contexts.
彼は負け知らずのチャンピオンだ。
He is an unbeatable champion.
このチームは今シーズン負け知らずだ。
This team is unbeaten this season.