Dictionary / Vocabulary / 負けず劣らず
まけずおとらず
equally (well); as ... as; no less ... than ...; neck and neck
彼女は彼女の妹に負けず劣らずかわいらしい。
She is just as charming as her sister.
彼は誰にも負けず劣らず正直な少年だ。
He is as honest a lad as any.