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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.

Rocket Lab stock fell 15% to $122.39 on Monday, following a rally in May and significant insider sales.

From Barron's • Jun. 3, 2026

DOJ is investigating former congressman George Santos for insider trading on Kalshi.

From MarketWatch • Jun. 3, 2026

The cost of an insider attack—by humans or agents—ranges from $1 million to $10 million, the firm said.

From The Wall Street Journal • Jun. 2, 2026

One posted on LinkedIn about being sponsored for the event by Fatmir Mediu, an Albanian government official and longtime Fellowship insider.

From Salon • May 29, 2026

It was an antiwar crowd, and Ellsberg sensed the students’ mistrust of a former Pentagon insider.

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

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