deter

verb

de·​ter di-ˈtər 

dē-

deterred; deterring

transitive verb

1

: to turn aside, discourage, or prevent from acting

Some buyers were deterred by the high price.

The new law deterred advertisers from making false claims.

2

: inhibit

painting to deter rust

determent

di-ˈtər-mənt 

dē-

noun

deterrability

di-ˌtər-ə-ˈbi-lə-tē 

dē-

noun

deterrable

di-ˈtər-ə-bəl 

dē-

adjective

Did you know?

The Fearful History of Deter

The word deter is rooted in fear. It was borrowed into English around the mid-16th century from the Latin verb deterrēre, which in turn was formed by combining de-, meaning "from" or "away," with terrēre, meaning "to frighten." Terrēre is also the source of terror, terrible, and even terrific, which originally meant "very bad" or "frightful." These days, you may be deterred by something that frightens you or by something that simply causes you to think about the difficult or unpleasant consequences of continuing. Things, as well as people, can be deterred: the word can also mean "to stop or limit something," as in "policies that aim to deter vandalism."

Synonyms of deter

• dissuade
• discourage

Examples of deter in a Sentence

Rick Wagoner, CEO of General Motors, the automaker in most imminent danger of failure, gave lawmakers three reasons Chapter 11 isn't an option. First, the special financing that usually tides companies over through reorganization is so scarce right now that GM might not be able to get enough to keep functioning. Second, the stigma of bankruptcy would deter consumers from buying GM cars. Third, GM is already in the midst of a dramatic reorganization that will pave the way to a profitable future. —Justin Fox, Time, 1 Dec. 2008

For some species that deter attack by being poisonous, the goal of their physical appearance is not to hide or confuse other forest creatures, but to be noticed. —Candice Millard, The River of Doubt, 2005

Originally developed to monitor and track cattle, radio frequency identification (RFID) is now the cutting edge in merchandise, parcel, and baggage tracking. It's debuting in stores and libraries across the country as the most effective way to track inventory and deter theft without making consumers feel like they're in a war zone. —Athan Bezaaitis, PC Magazine, January 2000

None of these tribulations deterred spectators in the least. The ancient Olympics remained immensely popular, the greatest recurring event in antiquity, from 776 b.c. (when Hercules himself was said to have founded them) until a ban on pagan festivals by Christian emperor Theodosius I in the fourth century a.d. ensured their demise—a spectacular thousand-year run. —Leigh Steinberg, Civilization, June/July 2000

Some potential buyers will be deterred by the price.

Painting the metal will deter rust.

Recent Examples on the Web

But there is a feeling Everton are hedging their bets; willing to sell at the right price — close to £20m — but having placed a valuation on him that may deter at least some potential suitors. — Patrick Boyland, New York Times, 14 July 2026

Larger pests, like slugs, are best controlled with hand-picking or by companion planting petunias with plants that naturally deter pests. — Lauren Landers, The Spruce, 14 July 2026

If the prospect of lines, crowds, and excessive noise is deterring you from a vacation this summer, then the area around Shippea Hill is the ultimate antidote. — Rob Crossan, Condé Nast Traveler, 13 July 2026

Captured on a home security camera and initially provided to Storyful, the footage shows the man, identified as Cortlandt Koerwitz, using bear spray to deter the approaching animal. — David Caraccio, Sacbee.com, 13 July 2026

Word History

Etymology

Latin deterrēre, from de- + terrēre to frighten — more at terror

First Known Use

circa 1547, in the meaning defined at sense 1

Rhymes for deter

• chauffeur
• cockspur
• concur
• confer
• defer
• demur
• hotspur
• incur
• infer
• inter
• jagir
• larkspur

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Kids Definition

deter

verb

de·​ter di-ˈtər 

deterred; deterring

1

: to turn aside, discourage, or prevent from acting

wasn't deterred by the threats

2

: inhibit sense 2

painting to deter rust

determent

-ˈtər-mənt 

noun