Thesaurus.com
Dictionary.com
Definitions

instigator

[in-sti-gey-ter] / ˈɪn stɪˌgeɪ tər /
NOUN
troublemaker
Synonyms
STRONGEST
ringleader
STRONG
agitator firebrand hellion incendiary inciter knave meddler mischief-maker nuisance provocateur punk rabble-rouser
WEAK
agent provocateur inflamer sparkplug wise guy

Frequently Asked Questions

What is another word for instigator?
Instigator is most commonly used in a negative way to refer to a person who provokes other people or incites trouble—often by instigating arguments or encouraging dangerous actions. Synonyms include agitator, antagonizer, provocateur, troublemaker, incendiary, and firebrand. Some instigators make elaborate plans to stir up trouble, but others are opportunists who find any opportunity to throw a match on a powder keg. The term agent provocateur is more specific than provocateur. An agent provocateur is a secret agent working to incite people into illegal actions so that they can be arrested.
What is the opposite (antonym) of instigator?
The opposite of instigating is trying to stop trouble, rather than starting it. In the context of an argument or conflict, such a person might be called a peacemaker or peacekeeper. The word troubleshooter can also be used in this way. Mediators try to help parties in a conflict to resolve it.
Is instigator a negative word?
Instigator is almost always used in a negative way in the context of someone starting trouble. It’s possible to be used positively in a way that’s ironic, as in instigator of peace. In neutral contexts involving things causing other things, the neutral word catalyst is a good choice.

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’s not clear who was the instigator when, several months ago, Amanda Ponce got into an altercation with a fellow resident at a Boyle Heights homeless housing site.

From Los Angeles Times • Apr. 14, 2026

According to their coach, Romain Haguenauer, this change of music was the result of behind-the-scenes manipulation -- the instigator allegedly an American judge, a compatriot of Chock and Bates.

From Barron's • Feb. 10, 2026

"It potentially acts as an instigator of early Alzheimer's pathology."

From Science Daily • Dec. 22, 2025

But whether it is an unexpected jump in claims costs or lower premiums that are the instigator, the upshot is that auto-insurance underwriting might now be past its peak profitability.

From The Wall Street Journal • Nov. 8, 2025

“Did you know that your employer, M. Ratchett, was the principal instigator in that affair?”

From "Murder on the Orient Express" by Agatha Christie