Definition of ninja

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Sportbikes produced by Kawasaki. It includes the 250R, 650R, ZX6R, ZX10R, and ZX14 among many others.

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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. In other words, a BAMF.