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What is the opposite of unhazardous?

Need antonyms for unhazardous? Here's a list of opposite words from our thesaurus that you can use instead.

Harmful, often in a subtle or unexpected way
“I see the deleterious consequences of this mistaken belief in many of my patients.”
Capable of causing harm, injury or death due to the presence of poison
“Made from non-renewable oil resources, they are toxic, do not biodegrade, and are harmful to animals.”
Dangerous or involving risks
“After breaking bad, Walter White would find himself in an awkward situation because his brother-in-law was the district attorney.”
Requiring or involving physical effort
“My personal trainer has come up with an energetic exercise routine.”
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