The difference between Mischievous and Pernicious
When used as adjectives, mischievous means causing mischief, whereas pernicious means causing much harm in a subtle way.
check bellow for the other definitions of Mischievous and Pernicious
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Mischievous as an adjective:
Causing mischief; injurious.
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Mischievous as an adjective:
Troublesome, cheeky, badly behaved.
Examples:
"Matthew had a twin brother called Edward, who was always mischievous and badly behaved."
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Pernicious as an adjective:
Causing much harm in a subtle way.
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Pernicious as an adjective:
Causing death or injury; deadly.
Examples:
"synonyms: attery"