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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.

Russini joined the Athletic in 2023 after nearly a decade at ESPN, where her roles included “SportsCenter” anchor and NFL analyst and insider.

From Los Angeles Times • Apr. 14, 2026

White House staff were warned last month not to use insider information to place bets on predictions markets.

From BBC • Apr. 9, 2026

Last quarter’s energy-sector insider sales reflected a mix of trades determined by prearranged trading plans, as well as ad hoc sales.

From The Wall Street Journal • Apr. 8, 2026

This is illustrated in the chart below, which plots the percentage of publicly traded companies for which there was net insider buying during March.

From MarketWatch • Apr. 6, 2026

Many times the primary author does not have enough insider knowledge of the language, and has to rely on someone with that knowledge to help with song lyrics and other cultural attributes.

From "Music and the Child" by Natalie Sarrazin