pestilent

pes·ti·lent  (pst-lnt)

adj.

1. Tending to cause death; deadly.

2. Likely to cause an epidemic disease.

3. Infected or contaminated with a contagious disease.

4. Morally, socially, or politically harmful; pernicious. See Synonyms at poisonous.

5. Causing annoyance or disapproval.

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[Middle English, from Old French, from Latin pestilns, pestilent-, from pestis, pestilence; see pest.]

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pestilent

Adjective

1. annoying or irritating

2. highly destructive morally or physically

3. likely to cause infectious disease [Latin pestis plague]

pestilential adj

Thesaurus

Adj.	1.	pestilent - exceedingly harmful baneful, pernicious, deadly noxious - injurious to physical or mental health; "noxious chemical wastes"; "noxious ideas"
	2.	pestilent - likely to spread and cause an epidemic disease; "a pestilential malignancy in the air"- Jonathan Swift; "plaguey fevers" pestilential, plaguey, pestiferous epidemic - (especially of medicine) of disease or anything resembling a disease; attacking or affecting many individuals in a community or a population simultaneously; "an epidemic outbreak of influenza"