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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. 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.

  3. 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.

  4. 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.

  5. 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.

  6. 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.

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

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

  8. 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.

  9. 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.

  10. www.ldoceonline.com › dictionary › harmfulharmful | meaning of harmful in Longman Dictionary of...

    This phrase is very commonly used in everyday English when saying that something is harmful Everyone knows that too much alcohol is bad for you. damaging used about things that cause permanent physical harm, or that have a bad effect in other ways, for example on people’s opinion of someone Acid rain has a damaging effect on trees and the soil.

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

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