A mercenary or warrior who is trained in the art of ninjutsu, or a Japanese martial-arts style which involves stealth, speed, mastery of various weapons and poisons, efficient and deadly combat tactics, and the will to commit seppuku, or suicide, to defend the honor of a particular family or clan.
The ninja's movement was like the water rippling against the disemboweled corpse of the samurai who dared to challenge him.
by AYB February 23, 2003
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Ninja were people of feudal japan trained in Ninpo or Ninjutsu. It was possible to use skills learned in assasination-which was done, but not coldly. Ninja's were japans peace keepers and information gathers-they would assasinate political powers that threatned peace of japan, and would often be recruited by a higher power (such as a warlord like Oda Nobunaga, or Ieyasu Tokugawa) to spy on enemy's and gather information. Ninja were originally called *Shinobi*, literally translating into a expert at information gathering. Ninja groups were divided into families and clans. The two regions were Ninjutsu developed and Ninja were founded were Iga and Koga provinces. there were roughly 53 subgroups of Koga and Iga. One of the most famous Ninja in history was Hattori Hanzo-a famous warlord and Ninja of Iga.
Random facts:
In 1676, the book Bansenshukai about Ninja methods was written by Fujibayashi Yasutake, a Samurai of Iga castle.
In 1681 the book Shoninki (correct Ninjutsu memories) was written by Fujibayashi Masatake.
In 1653 the book Ninpiden meaning secret teachings of Ninjutsu was written by Hattori Hanzo Yasunaga.
There were very few ninja-when oda nobunaga attacked Iga, 80 ninja fled.
Genbukan and Bujinkan are the only organizations keeping true Ninjutsu alive today.
Ninja didnt wear black very often-they wore deep red or dark green when on missions, and in winter snow, White.
Ninja were often Samurai too-afterall its only Title, not material.
Ninja didnt actually use straight swords much-only when they were desperate. After ninja had established themselves, they could use curved blades.
Other names used for ninja were Kancho, Shinobi, Kusa, Sppa, Rappa, Tsuppa, Mitsumoto(Kembun, Metsuke, Kaiken). Kyodan, Kanja, Choja, Shinobi no Mono, Onmitsu.
Ninja arent magical, they just understood sciences more advanced then the rest of the population of the time.
Ninja couldnt fly.
Ninja couldnt perform supernatural stunts.
Ninja can evade swords.
The Ninja stealthly entered his home.
by Ninpo-Bugei July 29, 2006
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The act of being a ninja or doing ninja related things, such as jumping building, running with your hands loosely behind you, or climbing up trees and hiding until your "Target" approaches.
He displayed his awesome Ninjaness when he jumped from that K-mart to the Subway.
by Brian the Ninja December 19, 2006
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A sex position where a dildo and a light switch is needed closed by. With the lights off proceed to have doggystyle sex with a woman and with a swift David Copperfield-esque motion, pull-out and stick the dildo in her so she thinks you are still in her. Then walk around to her front, switch on the lights, punch her in the face and yell, NINJA!!!
If The Ninja was done right, the mornings conversation should go like this:

Guy-"I totally Ninja'd you last night"
Girl-"You totally did"
by Command Center February 24, 2009
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One of the best and most famous fortnite players out there who is idolized by many children.
Josh: yo wanna watch ninja on twitch?

Daniel: No bro, PUBG is sooo much better
by Bathing Grape July 24, 2018
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v. 1.to move steathily, or in such a mannor as to conceal your actions
I'll just ninja into my cubicle so my boss doesn't notice im late
by Jester of AKs May 29, 2005
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The amount of inner ninja possessed by an individual.
That guy has so much ninjaness hes almost like Chuck Noris
by w00000000000t December 21, 2005
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