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say it: nuh-FER-ee-uhs
nefarious is an adjective meaning "extremely wicked". It carries one recorded sense.
extremely wicked
“nefarious schemes”
“a villainous plot”
“a villainous band of thieves”
Definitions, synonyms and semantic relations for nefarious come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.