Harmful effects of burning wood, harm•ful /ˈhɑrmfəl/ adj. Something that is harmful has a bad effect on something else, especially on a person's health. the harmful effects of smoking. [uncountable] WordReference Random House Unabridged Dictionary of American English © 2025 harm•ful (härm′ fəl), adj. We try to stress the things that could be inappropriate, things that could be harmful or embarrassing for you, your family or your team. The meaning of HARMFUL is of a kind likely to be damaging : injurious. Wear a hat to protect your skin from harmful sunlight. harmful If something is harmful to someone or harmful for them, it has a bad effect on them. Burning fossil fuels is harmful to the environment. Harmful definition: Causing or capable of causing harm; injurious. See examples of harmful used in a sentence. harm•ful•ly, adv. . causing or capable of causing harm. Definition of harmful adjective in Oxford Advanced American Dictionary. Definition of harmful. Harmful is a rock band from Frankfurt, Germany, founded in 1992 and frequently compared to early Helmet and more occasionally to Blackmail. causing or capable of causing harm; injurious: a harmful idea; a harmful habit. harm•ful•ness, n. The meaning of HARMFUL is of a kind likely to be damaging : injurious. Smoking is harmful to the lungs. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. HARMFUL definition: causing or capable of causing harm; injurious. English dictionary and integrated thesaurus for learners, writers, teachers, and students with advanced, intermediate, and beginner levels. You can also say that something is harmful to a thing. How to use harmful in a sentence. Jan 20, 2026 · Causing or likely to cause harm or damage; injurious. Potassium could be harmful for those with impaired kidneys. Too much salt can be harmful to a young baby. Harmful refers to something that is capable of causing damage, injury, or has a detrimental effect on one's health, well-being, or the environment. You do not suppress free speech; you eliminate harmful opinions, obscenity and corruption.


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