harmful

Things that are harmful hurt people, or are likely to hurt them. Listening to loud music through headphones can be harmful to your hearing.

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. Harmful words can hurt someone's feelings and harmful actions might put them in danger. The Old English hearm, "hurt, evil, or grief," is at the root of harmful.

Definitions of harmful
  1. adjective
    causing or capable of causing harm
    “too much sun is harmful to the skin”
    harmful effects of smoking”
    Synonyms:
    disadvantageous
    constituting a disadvantage
    malign
    evil or harmful in nature or influence
    destructive
    causing destruction or much damage
    abusive
    characterized by physical or psychological maltreatment
    bad
    capable of harming
    bruising
    causing mental or emotional injury
    deleterious, hurtful, injurious
    harmful to living things
    calumniatory, calumnious, defamatory, denigrating, denigrative, denigratory, libellous, libelous, slanderous
    (used of statements) harmful and often untrue; tending to discredit or malign
    catastrophic, ruinous
    extremely harmful; bringing physical or financial ruin
    counterproductive
    tending to hinder the achievement of a goal
    damaging, detrimental, prejudicial, prejudicious
    (sometimes followed by `to') causing harm or injury
    ill
    resulting in suffering or adversity
    insidious, pernicious, subtle
    working or spreading in a hidden and usually injurious way
    mischievous
    deliberately causing harm or damage
    nocent
    having a tendency to cause harm
    stabbing, wounding
    causing physical or especially psychological injury
    noxious
    injurious to physical or mental health
    offensive
    causing anger or annoyance
    painful
    causing physical or psychological pain
    toxic
    of or relating to or caused by a toxin or poison
    unwholesome
    detrimental to physical or moral well-being
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    Antonyms:
    harmless
    not causing or capable of causing harm
    benign, benignant
    pleasant and beneficial in nature or influence
    innocent, innocuous
    lacking intent or capacity to injure
    innocuous
    not injurious to physical or mental health
    painless
    not causing physical or psychological pain
    safe
    free from danger or the risk of harm
    atoxic, nontoxic
    not producing or resulting from poison
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