no less thanA formal or literary expression meaning “to a degree equal to” or “just as much as.” 劣らぬ is an older or formal form of 劣らない. It is often used in the pattern 勝るとも劣らぬくらい, meaning “no less than” or “at least as much as.”
JA: 彼の弟も、彼に劣らぬくらい才能がある。
EN: His younger brother is just as talented as he is.