糠ぬかに釘くぎぬかにくぎじ字FuriganaAudioMeanings1expression, nounhaving no effect; waste of effortidiomatic expression›Idiomatic expression likening a futile action to driving a nail into rice bran. Used to describe advice, criticism, or effort that produces no result.彼かれに注ちゅう意いしても糠ぬかに釘くぎだよ。Break this sentence down in the analyzerWarning him is like driving a nail into rice bran—it has no effect.そんなことを言いうのは糠ぬかに釘くぎだ。Break this sentence down in the analyzerSaying that is a waste of effort.