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Related to pestiferously: begrimed
a. Producing or breeding infectious disease.
b. Infected with or contaminated by an epidemic disease.
2. Morally evil or deadly; pernicious.
3. Bothersome; annoying.
[Middle English, from Latin pestiferus, variant of pestifer : pestis, pestilence; see pest + -fer, -fer.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.