pernicious, baneful, noxious, deleterious, detrimental mean exceedingly harmful. pernicious implies irreparable harm done through evil or insidious corrupting or undermining.

PERNICIOUS definition: causing insidious harm or ruin; ruinous; injurious; hurtful. See examples of pernicious used in a sentence.

PERNICIOUS meaning: 1. having a very harmful effect or influence: 2. having a very harmful effect or influence: 3…. Learn more.

Dec 21, 2025 · pernicious (comparative more pernicious, superlative most pernicious) (obsolete) swift; celeritous.

Definition of pernicious adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

If you describe something as pernicious, you mean that it is very harmful. Parents are blaming not only peer pressure but also the pernicious influence of the internet. There is a pernicious …

Factsheet What does the adjective pernicious mean? There are three meanings listed in OED's entry for the adjective pernicious. See ‘Meaning & use’ for definitions, usage, and quotation …

1. Tending to cause death or serious injury; deadly: a pernicious virus. 2. Causing great harm; destructive: pernicious rumors.

pernicious meaning, definition, what is pernicious: very harmful or evil, often in a way tha...: Learn more.

Pernicious means harmful and subtle, such as a poison gas that causes illness in those exposed to it over the course of years. Pernicious comes from the Latin perniciosus, "destructive," …