noun-modifying (irregular)
equally excellent; all outstanding; none inferior
A set phrase used prenominally to describe a group where every member is equally skilled, talented, or impressive; often carries a positive, admiring tone.
彼らはいずれ劣らぬ実力者ばかりだ。
They are all equally capable people.
いずれ劣らぬ名作が並んでいる。
Masterpieces, none inferior to the others, are lined up.
A more straightforward, less idiomatic way to say 'none are inferior'; いずれ劣らぬ is a fixed literary expression.
Means 'hard to rank' or 'equally matched', focusing on difficulty of comparison rather than inherent excellence.
A fixed phrase combining the classical pronoun いずれ ('which one') with the negative form of the verb 劣る (おとる, 'to be inferior') and the classical negative auxiliary ぬ. Literally 'none are inferior', it fossilized as a prenominal modifier.