noun which may take the genitive case particle 'no', na-adjective, noun
invincible; unbeatable; matchless
Describes someone or something that cannot be defeated or surpassed. Used as a noun, no-adjective, or na-adjective.
彼は無敵のチャンピオンだ。
He is an invincible champion.
このチームは今シーズン無敵だ。
This team is unbeatable this season.