Dictionary.com
Thesaurus.com
Synonyms

traitor

American  
[trey-ter] / ˈtreɪ tər /

noun

  • traitors
    plural
  1. a person who betrays another person, a cause, or any trust.

  2. a person who commits treason by betraying their country.


traitor British  
/ ˈtreɪtə /

noun

  1. a person who is guilty of treason or treachery, in betraying friends, country, a cause or trust, etc

"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

Other Word Forms

Derived Forms

Inflected Forms

Nouns

Etymology

Origin of traitor

First recorded in 1175–1225; Middle English from Old French from Latin trāditōr-, stem of trāditor “betrayer”; see traditor

Explanation

A traitor says one thing but does another. If you promise a friend you'll keep his secret, but instead you blab it to everyone, you're a traitor. The word origin says it all: traditorem is the Latin word for "betrayer." Liar? Yes. Backstabber? Yes. True friend? Heavens, no. Traitors betray the trust of those who have faith in them or believe their promises. Traitor also applies to a person who betrays his country by committing treason: turning against his own government, perhaps by selling secret information.

Keep Reading on Vocabulary.com

Vocabulary lists containing traitor

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

Over his 23-year career in the NBA, LeBron James has been a hero and a villain, a savior and a traitor.

From The Wall Street Journal Jul. 26, 2026

Christ was cornered — pay taxes to Rome, or be branded a traitor — and so he turned the trap into a statement about the limits of power.

From Salon Jul. 18, 2026

Wary of being called a traitor again, Elmo says he supports the U.S. soccer team.

From MarketWatch Jun. 22, 2026

Long condemned as a traitor, Malinche is being reimagined as a brilliant Indigenous survivor whose intelligence and resilience helped shape Mexico, amid a feminist and cultural reckoning that is rewriting her place in history.

From Los Angeles Times Feb. 15, 2026

When the other workers rushed in seconds before nine, Francie felt like a traitor.

From "A Tree Grows in Brooklyn" by Betty Smith

A total of 21 presenters, comedians, actors and musicians will try their hand at being good traitors and faithfuls in the show, which will air this autumn.

From BBC May 2, 2026

The show — loosely based on the game Mafia — selects celebrities to be faithfuls and traitors, and the faithful must attempt to discover the traitors.

From Los Angeles Times Apr. 18, 2026

His mission was to track down American traitors who had aided the Italian and Nazi war efforts.

From The Wall Street Journal Mar. 10, 2026

In response, a presenter on Iranian state television branded the side "wartime traitors".

From Barron's Mar. 9, 2026

“There may not be any Erudite or Dauntless traitors around, but it still feels weird, talking about it in public like this.”

From "Insurgent" by Veronica Roth

Vocabulary.com logo
by dictionary.com

Join 12,000,000 vocabulary learners

Start learning new words today on VocabTrainer.
You'll remember them forever.

Start training