Definition of hazardous in English:

hazardous

adjective

  • Risky; dangerous.

    ‘we work in hazardous conditions’
    ‘it is hazardous to personal safety’
    • ‘I will not explain the procedure since it may be hazardous to some motherboards.’
    • ‘They replaced a decaying wooden Celtic cross that was in a dangerous and hazardous state.’
    • ‘Much of the waste found on the beaches is fishing waste that can be extremely hazardous to wildlife.’
    • ‘Just sitting down near an open window can be hazardous to your health.’
    • ‘Trees used to be considered hazardous to farming, and in many cases they still are.’
    • ‘At least one candidate in the election reports that campaigning has proven hazardous to his health.’
    • ‘He made a fantastic landing in hazardous conditions.’
    • ‘The plan is to reduce the danger posed by hazardous hemlock trees which grow in abundance on the North Shore.’
    • ‘Lightening is much more hazardous to the farmer working alone in his field than a person in a crowded city street.’
    • ‘In the home garden it is now possible to substitute these highly toxic chemicals for ones that are less hazardous.’
    • ‘Workers said yesterday that they were entitled to these wages because of the hazardous nature of their jobs.’
    • ‘A contractor will remove ragwort, which is hazardous to many animals.’
    • ‘Staying in a hot tub or hot spring too long may be very hazardous to your health.’
    • ‘Always clear up after a fireworks party - litter is hazardous to domestic and wild animals.’
    • ‘He has been asked whether emissions from the refinery are hazardous to human health.’
    • ‘Hairdressing is one of the occupations most hazardous to the skin.’
    • ‘Gale force winds made driving conditions hazardous and caused traffic chaos in parts of the region today.’
    • ‘He added that it would be wrong to assume that mobile phones were hazardous to human health.’
    • ‘Waste can harm the environment and be hazardous to wildlife.’
    • ‘Running away was less dangerous than rebellion, but it was still a hazardous enterprise.’
    dangerous, risky, unsafe, perilous, precarious, insecure, tricky, unpredictable, uncertain, high-risk, touch-and-go, fraught with danger
    chancy, uncertain, undependable, unpredictable, precarious, speculative
    View synonyms

Origin

Mid 16th century: from French hasardeux, from hasard ‘chance’ (see hazard).

Pronunciation

hazardous

/ˈhazədəs/