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to be jealous of; to envy; to begrudge
「妬む」 has another reading with different meanings.
他人の成功を妬んではいけないと思います。
You shouldn't be jealous of others' success.
妬む気持ちを抑えるのはなかなか難しいです。
It's hard to suppress jealous feelings.
彼女の才能を妬む人が周りにいます。
There are people who envy her talent.