pernicious
adjective | /pernicious/
Essential WordsHARD
extremely harmful in a gradual or subtle way
pernicious
adjective | /pernicious/
Essential WordsHARDextremely harmful in a gradual or subtle way
Learning Progress
Synonyms
harmfuldestructiveinjuriousruinous
Antonyms
beneficialsalutaryharmless
Examples
"The pernicious effects of misinformation spread quickly online."
"A pernicious habit may damage health over time."
Etymology
from Latin perniciosus “destructive”
Source: Essential WordsAdded: 11/13/2025
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