ninja

American  

[nin-juh] / ˈnɪn dʒə /

noun

plural

ninja, ninjas

1. (often initial capital letter) a member of a feudal Japanese society of mercenary agents highly trained in martial arts and stealth ninjutsu, who were hired for covert purposes ranging from espionage to sabotage and assassination.

2. a person who is expert or highly skilled in a specified field or activity (often used attributively).

   marketing ninjas; ninja programmers.

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verb (used with object)

ninjaed, ninjaing

1. Slang. Also ninja loot (in a video game) to unfairly claim (valuable items or loot) from a treasure pool by taking them from a kill made by another player or bypassing the agreed-upon system for loot distribution in a group.

   When I ninja an epic item, I log off the server before anyone even realizes what happened.

ninja British  

/ ˈnɪndʒə /

noun

1. (sometimes capital) a person skilled in ninjutsu, a Japanese martial art characterized by stealthy movement and camouflage

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Etymology

Origin of ninja

First recorded in 1960–65; from Japanese, equivalent to nin- “endure” + -ja, combining form of -sha “person, agent” (from Middle Chinese, equivalent to Chinese rěn + zhě )

Explanation

A ninja was a skilled fighter in feudal Japan, starting in the fourteenth or fifteenth century. Today, people like to call themselves ninjas for doing anything well — from making a touchdown to surviving a treacherous obstacle course. The original ninjas were mercenary warriors and spies, and the methods they used were looked down on and considered dishonorable by the highest caste, the samurais. Ninjas were so fascinating and frequently discussed that they gained mythological status — in stories, people credited them with invisibility and the ability to walk on water, among other skills. In Japanese, the word ninja means "spy."

Example Sentences

Robinson also created other videos depicting Pitt battling a sword-wielding "zombie ninja," and another showing him teaming up with Cruise to fight a robot.

From Barron's • Apr. 24, 2026

"Background actors are like ninjas, and only ninjas can determine who else is a good ninja," Amaya told AFP.

From Barron's • Feb. 17, 2026

Ronan's Law, named after her son, will outlaw the manufacture, supply, sale, possession and importation of ninja swords.

From BBC • Aug. 1, 2025

Mark Joseph Stern: This is a classic Kagan ninja move.

From Slate • May 16, 2025

When he returned—the trip to the bathroom and back was nothing short of ninja brilliance—he was holding a roll.

From "As Brave As You" by Jason Reynolds