i Register
In some senses, pernicious is marked as obsolete. Watch for register when choosing this word.
pernicious
UK /pəˈnɪʃəs/ US /pɚˈnɪʃəs/
adj 4
Definitions
adj
1
Causing much harm in a subtle way.
pernicious influence
pernicious effects
2
Causing death or injury; deadly.
3
Insidiously villainous: intending to cause harm, especially in a subtle way.
adj
1
swift; celeritous.
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