All benign antonyms

adj benign

• unkind — lacking in kindness or mercy; severe.
• unfriendly — not amicable; not friendly or kindly in disposition; unsympathetic; aloof: an unfriendly coldness of manner.
• hateful — arousing hate or deserving to be hated: the hateful oppression of dictators.
• hostile — of, relating to, or characteristic of an enemy: a hostile nation.
• hurtful — causing hurt or injury; injurious; harmful.
• injurious — harmful, hurtful, or detrimental, as in effect: injurious eating habits.
• malignant — disposed to cause harm, suffering, or distress deliberately; feeling or showing ill will or hatred.
• disadvantageous — characterized by or involving disadvantage; unfavorable; detrimental.
• harmful — causing or capable of causing harm; injurious: a harmful idea; a harmful habit.
• cancerous — Cancerous cells or growths are cells or growths that are the result of cancer.
• rough — having a coarse or uneven surface, as from projections, irregularities, or breaks; not smooth: rough, red hands; a rough road.
• violent — acting with or characterized by uncontrolled, strong, rough force: a violent earthquake.
• harsh — ungentle and unpleasant in action or effect: harsh treatment; harsh manners.
• bad — If you say that it is bad that something happens, you mean it is unacceptable, unfortunate, or wrong.
• severe — harsh; unnecessarily extreme: severe criticism; severe laws.