Mukagen

無下限

literallyno lower limit

Gojo's Limitless.

Spelling checked against this reference.

Character by character

無nothingness, none, ain'tムブな.い12 strokes · taught in grade 4 下below, down, descendカゲしたしも3 strokes · taught in grade 1 限limit, restrict, to best of abilityゲンかぎ.るかぎ.り -かぎ.り9 strokes · taught in grade 5

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The same characters show up in everyday Japanese. This is where one anime word turns into ten real ones.

無

皆無かいむnonexistent
虚無きょむnihility
無益むえきuseless
無縁むえんunrelated
無休むきゅうwithout a holiday

下

以下いかnot exceeding ...
右下みぎしたlower right
下位かいlow rank
下院かいんlower house
下火したびdying down (of a fire)

限

下限かげんlower limit
期限きげんterm
極限きょくげんutmost limits
権限けんげんpower
限界げんかいlimit

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