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Definitions

insider

[in-sahy-der] / ˌɪnˈsaɪ dər /
NOUN
accessory
Synonyms
STRONG
abettor accomplice aid aide assistant associate colleague confederate conspirator helper partner plant ringer shill stall subordinate
WEAK
co-conspirator
Antonyms
STRONG
antagonist boss enemy foe leader opponent superior
WEAK
principal
NOUN
accomplice
Synonyms
STRONGEST
aide associate co-conspirator collaborator conspirator
STRONG
abettor accessory aid ally assistant colleague confederate partner plant stall
Antonyms
STRONG
antagonist enemy
WEAK
adversary opponent
NOUN
cognoscente
Synonyms
STRONG
connoisseur critic expert judge specialist
Antonyms
STRONG
ignoramus

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.

“It was not that important,” she said of her 2004 trial for acting on insider information and lying to federal prosecutors.

From Salon • Apr. 16, 2026

The White House has warned staff against insider trading.

From The Wall Street Journal • Apr. 14, 2026

Donna Bojarsky, a longtime Democratic political insider in Los Angeles, attended Swalwell fundraisers this year thrown by Hollywood business leaders.

From Los Angeles Times • Apr. 13, 2026

The latest insider ratio would need to be even higher before the Seyhuns would classify it as solidly bullish.

From MarketWatch • Apr. 6, 2026

His hope was to use his position as an insider to influence key decision makers.

From "Most Dangerous: Daniel Ellsberg and the Secret History of the Vietnam War" by Steve Sheinkin