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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.

The changes will require development to existing engines but a senior insider said: "Everybody is in the mood for a challenge."

From BBC • May 8, 2026

The guidance, circulated to staff this spring, emphasizes that “you must be cautious” when using prediction markets and warns against insider trading.

From Barron's • May 7, 2026

They also noted that definitively proving who made these trades, and whether or not they were inspired by insider knowledge, would be difficult.

From MarketWatch • May 6, 2026

They want the insider scoop over these worlds that still capture our imaginations, propelling them into new and fantastical places while keeping us grounded in human creativity.

From Salon • May 6, 2026

But Ellsberg was still a trusted Washington insider.

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