harmful

(härm'fəl)
adj.
Causing or capable of causing harm; injurious.

harmfully harm'ful·ly adv.
harmfulness harm'ful·ness n.

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adjective

Causing harm or injury: bad, deleterious, detrimental, evil, hurtful, ill, injurious, mischievous. See help/harm/harmless.

adj

Definition: injurious, hurtful
Antonyms: aiding, assisting, helpful, nice, unharmful

IN BRIEF: adj. - Constituting a disadvantage; Causing or capable of causing injury; Injurious to physical or mental health adj. - Tending to cause great injury; Contrary to your interests or welfare.

Inhumanity is harmful in every age. — Cicero

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