Submitted by György Chityil ... on Fri, 01/19/2018 - 23:26 Hierarchy: NounDescription: {{martial arts}} A person trained primarily in stealth, espionage, assassination and the Japanese martial art of ninjutsu.Ngram: ninjaNgram Text: ninjaSource: WiktionaryIssue: 0Wiktionary tag: martial artsNgram Count: 1