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Adjective pestilent has 2 senses
baneful, deadly, pernicious, pestilent - exceedingly harmfulAntonyms:  innocuous, harmless (indirect, via noxious)
 
pestilent, pestilential, pestiferous, plaguey - likely to spread and cause an epidemic disease; "a pestilential malignancy in the air"- Jonathan Swift; "plaguey fevers"Antonyms:  endemic, endemical (indirect, via epidemic, ecdemic)
 Antonym:  ecdemic (indirect, via endemic, epidemic)
 
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