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hazardous (adj.)

1580s, "venturesome;" 1610s, "perilous," from hazard (n.) + -ous or from Middle French hasardeux (16c.).

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Definitions of hazardous from WordNet

hazardous (adj.)
involving risk or danger;
skydiving is a hazardous sport
Synonyms: risky / wild
From wordnet.princeton.edu