Princeton's WordNet

1. matchless, nonpareil, one(a), one and only(a), peerless, unmatched, unmatchable, unrivaled, unrivalled(adj)

   eminent beyond or above comparison

   "matchless beauty"; "the team's nonpareil center fielder"; "she's one girl in a million"; "the one and only Muhammad Ali"; "a peerless scholar"; "infamy unmatched in the Western world"; "wrote with unmatchable clarity"; "unrivaled mastery of her art"

Wiktionary

1. unrivalled(Adjective)

   having no rival; better than any possible competitor

• ongeëwenaardAfrikaans
• لا يُجارى، مُنْقَطِع النَّظيرArabic
• ненадминатBulgarian
• inigualadoPortuguese (BR)
• bez konkurenceCzech
• konkurrenzlosGerman
• uovertruffenDanish
• ασυναγώνιστος, απαράμιλλοςGreek
• único, sin rival, sin parSpanish
• rivaalitult parimEstonian
• بی نظیر؛ بی رقیبFarsi
• verratonFinnish
• sans rivalFrench
• לְלא מִתחָרֶהHebrew
• बेमिसालHindi
• bez premcaCroatian
• versenytárs nélküliHungarian
• tanpa tandinganIndonesian
• óviðjafnanlegurIcelandic
• (senza pari)Italian
• 無比のJapanese
• 경쟁 상대가 없는Korean
• neturintis sau lygiųLithuanian
• nesalīdzināms; nepārspētsLatvian
• tdk ada bandingannyaMalay
• ongeëvenaardDutch
• uforliknelig, uovertruffenNorwegian
• niezrównanyPolish
• incomparávelPortuguese
• fără rivalRomanian
• непревзойдённыйRussian
• bez konkurencie, jedinečnýSlovak
• brez tekmecaSlovenian
• nenadmašanSerbian
• oöverträffad, som saknar motstyckeSwedish
• ซึ่งไร้คู่แข่งThai
• rakipsiz, eşsizTurkish
• 無與倫比的Chinese (Trad.)
• неперевершенийUkrainian
• جس کا کوئي مقابل نہ ہوUrdu
• vô địchVietnamese
• 无与伦比的Chinese (Simp.)