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to be inferior to; to be less good at; to fall behind
彼は数学では他の生徒に劣らない実力だ。
He is not inferior to other students in mathematics.
品質は高級品に劣らないと自信がある。
I am confident that the quality is not inferior to luxury items.
彼の作品は有名画家に劣らぬ素晴らしさだ。
His work is as excellent as that of famous painters.