/ Thesaurus / N Synonyms of ninjitsu Find synonyms for: Noun1. ninjutsu, ninjitsu, martial artusage: the traditional Japanese method of espionage; involves stealthy movements and the use of camouflageWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: magnanimous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language