1. 无与伦比的；无可匹敌的；无双的
    If you describe something as unrivalled, you are emphasizing that it is better than anything else of the same kind.

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    e.g. He had an unrivalled knowledge of south Arabian society, religion, law and customs...
           他对南阿拉伯社会、宗教、法律和风俗的了解无人可比。
    e.g. It''s a team unrivalled in stature, expertise and credibility.
           这个团队的名声、专业技能和信誉都是无可匹敌的。

1. eminent beyond or above comparison

    e.g. 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

    Synonym: matchlessnonpareilone(a)one and only(a)peerlessunmatchedunmatchableunrivaled