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adj. Pestilent. See Synonyms at poisonous.

adj. Producing pestilence or plague; pestilent

adj. Having the nature or qualities of a pestilence.

adj. Hence: Mischievous; noxious; pernicious; morally destructive.

Producing or tending to produce infectious disease; pestiferous.

Mischievous; pernicious; destructive.

Partaking of the nature of pestilence or any infectious and deadly disease: as, a pestilential fever. See fever.

adj. likely to spread and cause an epidemic disease

"In comments on his table, Potter says that he has doubtless included mention of many plagues which, although described under that name, are probably a dissimilar disease, writers having applied the terms pestilential and pestilent in a generic sense to diseases specifically different."

epidemic   

noxious    pernicious    deadly    harmful    troublesome   

malarious    noisome    fetid    pestiferous    noxious