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infest

[ in-fest ]
/ ɪnˈfɛst /
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See synonyms for: infest / infested / infesting / infests on Thesaurus.com

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.
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Origin of infest

1375–1425; late Middle English <Latin infestāre to assail, molest, derivative of infestus hostile

OTHER WORDS FROM infest

in·fest·er, nounre·in·fest, verb (used with object)un·in·fest·ed, adjective

WORDS THAT MAY BE CONFUSED WITH infest

infect, infest , invest
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use infest in a sentence

British Dictionary definitions for infest

infest
/ (ɪnˈfɛst) /

verb (tr)
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 of infest

infestation, nouninfester, noun

Word Origin for infest

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
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