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dangerous

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adjective American English pronunciation: dangerous /ˈdeɪndʒərəs/
  1. 1
    likely to harm or kill someone, or to damage or destroy something

    a dangerous dog

    a dangerous stretch of road

    Air pollution has reached dangerous levels in some cities.

    highly dangerous:

    an exciting but highly dangerous sport

    dangerous to:

    It is not yet known whether these chemicals are dangerous to humans.

    it is dangerous (for someone) to do something:

    It's dangerous to walk around here on your own at night.

  2. 2
    likely to have a bad effect or to cause a problem

    Mr. Ashley is playing a dangerous game, pretending to support warring factions.

    it is dangerous (for someone) to do something:

    It is extremely dangerous for you to get involved in this.

    a dangerous precedent (=a decision that others will follow and that will cause problems):

    The firing of Mr. Nolan could set a dangerous precedent.

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