Try Our Apps


90s Slang You Should Know


[in-fest] /ɪnˈfɛst/
verb (used with object)
to live in or overrun to an unwanted degree or in a troublesome manner, especially as predatory animals or vermin do:
Sharks infested the coastline.
to be numerous in, as anything undesirable or troublesome:
the cares that infest the day.
Archaic. to harass.
Origin of infest
late Middle English
1375-1425; late Middle English < Latin infestāre to assail, molest, derivative of infestus hostile
Related forms
infester, noun
reinfest, verb (used with object)
uninfested, adjective
Can be confused
infect, infest, invest. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
Cite This Source
Examples from the Web for infested
Contemporary Examples
Historical Examples
  • Horse manure should not be used in seed beds likely to be infested by woodlice.

  • The Poplar tree is infested by an other species of Saperda (S. calcarata).

    Our Common Insects Alpheus Spring Packard
  • But the monster which infested the Lieue de Grve was no ordinary dragon.

  • If there be atheists, which I doubt, they are the calumniators, the intriguers with whom the world is infested.

    Dona Perfecta B. Perez Galdos
  • Directly we moved into our house I found to my horror that it was infested with white ants.

  • “They've infested the house with mikerots, with mikerots,” she says.

    Fruits of Culture Leo Tolstoy
  • Gikuting ang mga silya sa sinihan, The seats in the movie house are infested with bedbugs.

  • It was infested with alligators, which filled the air with a musky odour.

    Notable Voyagers W.H.G. Kingston and Henry Frith
British Dictionary definitions for infested


verb (transitive)
to inhabit or overrun in dangerously or unpleasantly large numbers
(of parasites such as lice) to invade and live on or in (a host)
Derived Forms
infestation, noun
infester, noun
Word Origin
C15: from Latin infestāre to molest, from infestus hostile
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Cite This Source
Word Origin and History for infested



late 15c., "to attack, assail, hurt, distress, annoy," from Middle French infester, from Latin infestare "to attack, disturb, trouble," from infestus "hostile, dangerous," originally "inexorable, not able to be handled," from in- "not, opposite of" (see in- (1)) + -festus "(able to be) seized." Sense of "swarm over in large numbers" first recorded c.1600. Related: Infested; infesting.

Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
infested in Medicine

infest in·fest (ĭn-fěst')
v. in·fest·ed, in·fest·ing, in·fests

  1. To live as a parasite in or on tissues or organs or on the skin and its appendages.

  2. To inhabit or overrun in numbers large enough to be harmful, threatening, or obnoxious.

in'fes·ta'tion n.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Cite This Source

Word of the Day

Difficulty index for infest

Some English speakers likely know this word

Word Value for infested

Scrabble Words With Friends

Nearby words for infested