pernicious [adjective]: causing injury or harm.
Example: Narcotic drugs have a pernicious effect on the youth.
Related words: perniciously [adverb], perniciousness [noun]
Synonyms: bad, baleful, dangerous, deadly, deleterious, destructive, detrimental, evil, fatal, harmful, lethal, maleficent, malignant, noxious poisonous, ruinous, toxic, venomous, virulent
Antonyms: advantageous, beneficial, benign, constructive, good, salubrious, salutary, useful, valuable, wholesome
Tags: GRE
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