pestilent

Adjective
Synonyms: banefuldeadlyperniciouspestilentialpestiferousplaguey

WordNet 3.0

Adjective (2)

  1. exceedingly harmfulSynonyms: banefuldeadlypernicious
  2. likely to spread and cause an epidemic disease“a pestilential malignancy in the air — Jonathan Swift”“plaguey fevers”Synonyms: pestilentialpestiferousplaguey
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Webster's Dictionary (GCIDE)

Pestilent \Pes"ti*lent\, a. [L. pestilens, -entis, fr. pestis pest: cf. F. pestilent.] Pestilential; noxious; pernicious; mischievous. "Corrupt and pestilent." --Milton. "What a pestilent knave is this same!" --Shak. [1913 Webster]
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