noun, noun or participle which takes 'suru', intransitive verb
wasted effort; laboring in vain
Describes effort that yields no result; often used with する to mean 'to work in vain'. Similar to 無駄骨.
See also: 無駄骨
彼の努力は無駄骨折りに終わった。
His efforts ended up being wasted.
そんなことをしても無駄骨折りだよ。
Even if you do that, it'll be a waste of effort.