無駄骨折り むだぼねおり Meanings Noun, する verb, Intransitive laboring in vain; wasted effort; vain efforts See also: 無駄骨 (むだぼね). Kanji 無 without. Read as ム. 駄 useless 骨 bone. Read as ほね. 折 fold. Read as おり. Jinuma: Japanese Dictionary · Word lists