pestilent
pes-ti-lent
adjective
Annoying, troublesome, or morally harmful; causing widespread trouble.
"His pestilent influence corrupted the youth."
adjective
Causing or spreading infectious disease; harmful to public health.
"The pestilent air carried the deadly plague."
Thesaurus
Synonyms: pernicious, baneful, noxious, deadly, plaguey, pestiferous, pestilential, epidemic