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From Middle English infesten, from Old French infester (to infest), from Latin īnfestō (assail, molest, verb), from īnfestus (hostile).


  • IPA(key): /ɪnˈfɛst/
  • (file)
  • Rhymes: -ɛst


Aphids infest a rosebush

infest (third-person singular simple present infests, present participle infesting, simple past and past participle infested)

  1. (transitive) To inhabit a place in unpleasantly large numbers; to plague, harass.
    Insects are infesting my basement!
    • 1610–1611 (date written), William Shakespeare, “The Tempest”, in Mr. William Shakespeares Comedies, Histories, & Tragedies [] (First Folio), London: [] Isaac Iaggard, and Ed[ward] Blount, published 1623, →OCLC, [Act V, scene i]:
      Sir, my liege,
      Do not infest your mind with beating on
      The strangeness of this business; at pick’d leisure
      Which shall be shortly, I’ll resolve you,
      Which to you shall seem probable, of every
      These happen’d accidents; till when, be cheerful
      And think of each thing well.
    • 1724, Daniel Defoe (attributed), “Introduction”, in A General History of the Pirates[1], 2nd edition, London: T. Warner, page 24:
      I come now to speak of the Pyrates infesting the West-Indies, where they are more numerous than in any other Parts of the World, on several Reasons []
    • 1791, Oliver Goldsmith, “Of Mummies, Wax-Works, &c.”, in An History of the Earth, and Animated Nature. [], new edition, volume II, London: [] F[rancis] Wingrave, successor to Mr. [John] Nourse, [], →OCLC, page 252:
      It has often happened, that whole caravans have perished in crossing those deserts, either by the burning winds that infest them, or by the sands which are raised by the tempest, and overwhelm every creature in certain ruin.
    • 1847 March 30, Herman Melville, chapter 3, in Omoo: A Narrative of Adventures in the South Seas; [], London: John Murray, [], →OCLC:
      Nor was the biscuit much better; nearly all of it was broken into hard, little gunflints, honeycombed through and through, as if the worms usually infesting this article in long tropical voyages had, in boring after nutriment, come out at the antipodes without finding anything.
  2. (pathology, of a parasite) To invade a host plant or animal.


Related terms[edit]



infest (comparative more infest, superlative most infest)

  1. (obsolete) Mischievous; hurtful; harassing.


infest (uncountable)

  1. (obsolete) Hostility.
    • 1590, Edmund Spenser, The Faerie Queene, Book II, Canto Eleven, Stanza 32, Hackett, 2006, p. 191,
      Like as a fire, the which in hollow cave
      Hath long bene underkept, and down supprest,
      With murmurous disdayne doth inly rave,
      And grudge, in so streight prison to be prest,
      At last breakes forth with furious infest,
      And strives to mount unto his native seat []