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to be jealous of; to envy; to begrudge
「嫉む」 has another reading with different meanings.
才能のある人を嫉む者は昔からいるものだ。
There have always been people who begrudge those with talent.
嫉む心があると素直に人を認められなくなる。
When you harbor envy, you cannot honestly acknowledge others.
友人の幸せを嫉むのではなく共に喜びたいものだ。
Rather than begrudging a friend's happiness, one should share in their joy.