Synonyms for Pernicious:
•bad, hurtful (adjective)
fatal, deadly, damaging, pestilent, prejudicial, sinister, noxious, malignant, harmful.
prejudicial, fatal, sinister, malignant, risky, damaging.
n.hazardous, perilous, disastrous, risky, unsafe. malignant, help. •pernicious (noun)
harmful, pestilent, subtle, insidious, baneful, deadly, noxious.
Usage examples for pernicious
" That pernicious girl is communicating with Godfrey," he said to himself, " which I particularly wish to prevent." – Love Eternal by H. Rider Haggard