An instigator is someone who starts trouble or stirs up conflict, often deliberately and sometimes while staying safely on the sidelines. At recess, an instigator might whisper to one friend that another friend said something mean about them (whether true or not), then step back and watch the argument unfold. In a classroom, an instigator might encourage others to break a rule while being careful not to break it themselves.

While instigation can sometimes be neutral (a teacher might instigate a productive debate about a historical event), the word instigator usually carries a negative tone. It suggests someone who creates problems without taking responsibility for the consequences.

An instigator is different from someone who simply has a disagreement or makes a mistake. Instigators operate with intention: they want something to happen, usually something disruptive. They might instigate a fight, instigate a prank that gets others in trouble, or instigate rumors that damage friendships. The key characteristic is starting something, then disappearing when things get messy, leaving others to face the consequences of the chaos they created.