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Definitions from the Web

Antonyms for Benign

Adjective

Sense 1: Harmful, malevolent, malignant

Example Sentence: The doctor discovered a malignant tumor during the examination.

Sense 2: Dangerous, detrimental, destructive

Example Sentence: The chemical has detrimental effects on the environment.

Noun

Sense 1: Enemy, opponent, antagonist

Example Sentence: The hero finally defeated his arch nemesis.

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For more information on antonyms for benign, you can check out the following products on Amazon:

• Malignant Disease
• Detrimental Effects
• Arch Nemesis