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  1. Dictionary
    harmful
    /ˈhɑːmf(ʊ)l/

    adjective

    • 1. causing or likely to cause harm: "the ozone layer blocks the harmful rays from the sun"

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    More definitions, origin and scrabble points

  2. www.merriam-webster.com › dictionary › harmfulHarmful Definition & Meaning - Merriam-Webster

    The meaning of HARMFUL is of a kind likely to be damaging : injurious. How to use harmful in a sentence.

  3. dictionary.cambridge.org › dictionary › englishHARMFUL | English meaning - Cambridge Dictionary

    adjective. uk / ˈhɑːm.f ə l / us / ˈhɑːrm.f ə l / Add to word list. B2. causing harm: harmful to This group of chemicals is known to be harmful to people with asthma. Synonyms. damaging. deleterious formal. detrimental formal. injurious formal. prejudicial formal. Opposites. harmless. innocuous. Compare. hurtful.

  4. dictionary.cambridge.org › us › dictionaryHARMFUL | definition in the Cambridge English Dictionary

    adjective. us / ˈhɑːrm.f ə l / uk / ˈhɑːm.f ə l / Add to word list. B2. causing harm: harmful to This group of chemicals is known to be harmful to people with asthma. Synonyms. damaging. deleterious formal. detrimental formal. injurious formal. prejudicial formal. Opposites. harmless. innocuous. Compare. hurtful.

  5. www.vocabulary.com › dictionary › harmfulHarmful - Definition, Meaning & Synonyms | Vocabulary.com

    Harmful is an adjective that comes in handy when you're talking about things that cause injury to someone or damage something. Burning coal can be harmful to the environment, and eating too much candy can be harmful for your teeth.

  6. www.oxfordlearnersdictionaries.com › definition › englishharmful adjective - Definition, pictures, pronunciation and usage...

    causing damage or injury to somebody/something, especially to a person’s health or to the environment. Many household products are potentially harmful. harmful to somebody/something Exercising in polluted air is harmful to your health. Fruit juices can be harmful to children's teeth.

  7. www.dictionary.com › browse › harmfulHARMFUL Definition & Meaning | Dictionary.com

    Harmful definition: causing or capable of causing harm; injurious. See examples of HARMFUL used in a sentence.

  8. www.collinsdictionary.com › dictionary › englishHARMFUL definition and meaning | Collins English Dictionary

    Something that is harmful has a bad effect on something else, especially on a person's health. ...the harmful effects of smoking. It believed the affair was potentially harmful to British aviation.

  9. www.thefreedictionary.com › harmfulHarmful - definition of harmful by The Free Dictionary

    Define harmful. harmful synonyms, harmful pronunciation, harmful translation, English dictionary definition of harmful. adj. Causing or capable of causing harm; injurious. harm′ful·ly adv. harm′ful·ness n.

  10. www.oxfordlearnersdictionaries.com › definition › american_englishharmful adjective - Definition, pictures, pronunciation and usage...

    Definition of harmful adjective in Oxford Advanced American Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

  11. dictionary.cambridge.org › dictionary › learner-englishHARMFUL | meaning - Cambridge Learner's Dictionary

    HARMFUL definition: causing or likely to cause harm: . Learn more.