perturb

verb

per·​turb pər-ˈtərb 

perturbed; perturbing; perturbs

transitive verb

1

: to cause to be worried or upset : disquiet, unsettle

Half way down the next flight, she smiled to think that a char-woman's stare should so perturb her.

—Edith Wharton

The crowd didn't seem to perturb them in the slightest …

—Nick Hornby

2

: to throw into confusion : disorder

perturbing the social order

3

: to cause to experience a perturbation see perturbation sense 2

Newton finally realized that the planetary orbits would be only approximate ellipses, for the mutual attractions of the planets would perturb their paths.

—Owen Gingerich

perturbable

pər-ˈtər-bə-bəl 

adjective

Did you know?

With its per- prefix, perturb meant originally "thoroughly upset", though today the word has lost most of its intense edge. Perturb and perturbation are often used by scientists, usually when speaking of a change in their data indicating that something has affected some normal process. When someone is referred to as imperturbable, it means he or she manages to remain calm through the most trying experiences.

Synonyms

• agitate
• ail
• alarm
• alarum
• bother
• concern
• derail
• discomfort
• discompose
• dismay
• disquiet
• distemper
• distract
• distress
• disturb
• exercise
• flurry
• frazzle
• freak (out)
• fuss
• hagride
• undo
• unhinge
• unsettle
• upset
• weird out
• worry

Choose the Right Synonym for perturb

discompose, disquiet, disturb, perturb, agitate, upset, fluster mean to destroy capacity for collected thought or decisive action.

discompose implies some degree of loss of self-control or self-confidence especially through emotional stress.

discomposed by the loss of his beloved wife

disquiet suggests loss of sense of security or peace of mind.

the disquieting news of factories closing

disturb implies interference with one's mental processes caused by worry, perplexity, or interruption.

the discrepancy in accounts disturbed me

perturb implies deep disturbance of mind and emotions.

perturbed by her husband's strange behavior

agitate suggests obvious external signs of nervous or emotional excitement.

in his agitated state we could see he was unable to work

upset implies the disturbance of normal or habitual functioning by disappointment, distress, or grief.

the family's constant bickering upsets the youngest child

fluster suggests bewildered agitation.

his declaration of love completely flustered her

Examples of perturb in a Sentence

It perturbed him that his son was thinking about leaving school.

the caller's strange remark perturbed me enough to keep me awake that night

Recent Examples on the Web

As the grandson of four immigrants who landed on Ellis Island, David has become particularly perturbed by debate in the U.S. around immigration. —Ryan Hogg, Fortune Europe, 20 Mar. 2024

He was more perturbed by the omission of Sabonis, who leads the NBA in rebounding, double-doubles and triple-doubles. —Jason Anderson, Sacramento Bee, 16 Feb. 2024

This led to a deluge of good Twitter jokes and memes about the former President of the United States fielding a very stern, perturbed phone call from one of the film’s producers — Oprah. —Jon Blistein, Rolling Stone, 29 Dec. 2023

Jacobs noted she was particularly perturbed by the effusive reaction to the film online. —EW.com, 23 Oct. 2023

Alvin Gray is no stranger to going viral Gray has gotten flack for trivializing sensitive subjects but says that does not perturb him. —The Indianapolis Star, 14 Mar. 2024

The notion of nonhuman animal rights has perturbed numerous legal scholars, prominent among them Richard A. Posner, a former federal judge who taught at the University of Chicago. —Sam Roberts, New York Times, 22 Feb. 2024

His doctors suggest that COVID may have perturbed his immune system. —Lisa M. Krieger, The Mercury News, 31 Jan. 2024

He also was perturbed that Fanatics was signing exclusive deals with star players like Victor Wembanyama, the rookie center on the San Antonio Spurs, even though its license with the N.B.A. doesn’t start for a few years. —Ken Belson, New York Times, 26 Jan. 2024

Word History

Etymology

Middle English, from Middle French perturber, from Latin perturbare to throw into confusion, from per- + turbare to disturb — more at turbid

First Known Use

14th century, in the meaning defined at sense 1

Kids Definition

perturb

verb

per·​turb pər-ˈtərb 

: to disturb greatly especially in mind

perturbable

-ˈtər-bə-bəl 

adjective