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pernicious
adjective
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How to pronounce pernicious:

Definition of pernicious:

pernicious (adjective):
exceedingly harmful.
highly injurious or destructive deadly

Synonyms for pernicious:

baddeleteriousevilbalefulhazardoustoxicdetrimentalmaliciousmaleficentinfectious
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Antonyms for pernicious:

innocuousunexceptionablesafebenigninoffensivefriendlyanodynegentleguiltlessinnocent
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Other 4-syllable words like pernicious

Here are some other common words that have 4 syllables, like pernicious does.

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The longest English word without repeated letters, 'uncopyrightable', has seven syllables.

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