pestilent

[pes-tl-uhnt]
adjective
1.
producing or tending to produce infectious or contagious, often epidemic, disease; pestilential.
2.
destructive to life; deadly; poisonous.
3.
injurious to peace, morals, etc.; pernicious.
4.
troublesome, annoying, or mischievous.

Origin:
1350–1400; Middle English < Latin pestilent- (stem of pestilēns) unhealthy, noxious, alteration of pestilentus, equivalent to pesti- (stem of pestis) pest + -lentus -lent

pestilently, adverb
antipestilent, adjective
antipestilently, adverb
nonpestilent, adjective
nonpestilently, adverb
unpestilent, adjective
unpestilently, adverb
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World English Dictionary
pestilent (ˈpɛstɪlənt)
 
adj
1.  annoying; irritating
2.  highly destructive morally or physically; pernicious
3.  infected with or likely to cause epidemic or infectious disease
 
[C15: from Latin pestilens unwholesome, from pestis plague]
 
'pestilently
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
In any case, the final aim must be to burn out entirely this pestilent abscess.
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