Definition from macmillandictionary.com
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a dangerous dog
a dangerous stretch of road
Air pollution has reached dangerous levels in some cities.
an exciting but highly dangerous sport
Children are taught to avoid potentially dangerous situations.
It is not yet known whether these chemicals are dangerous to humans.
It’s dangerous to walk around here on your own at night.
Mr Ashley is playing a dangerous game, pretending to support both parties.
It is extremely dangerous for you to get involved in this.
The sacking of Mr Nolan could set a dangerous precedent.