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ググったら英英辞書出るんだから読みなさいよ

legendary
adjective
1.described in or based on legends.
"a legendary British king of the 4th century"

2.remarkable enough to be famous; very well known.
"her wisdom in matters of childbirth was legendary"

弥助はそもそもどマイナーだから1の意味だろ

ちなみに海外でレジェンダリー装備とかあるけどあれも性能がすごいじゃなくてレア度の話だぞ