How to say "needless" in Japanese

• いらぬCommon
  pre-noun adjectivalCovers the basic sense of something simply not being needed. A common word usually written in kana, it is a direct way to say that a thing is not needed.
• 不必要ふひつようCommon
  na-adjective, nounThe neutral equivalent of 'unnecessary': it states as a plain fact that something is not needed, and it fits explanations and discussion of what is or is not required.
  あなたは不必要ふひつような語ごは消けしたほうがよい。↗

  You should cross out any word you don't need.
• 余計よけいJLPT N2approx.Common
  na-adjectiveImplies more than a plain lack of need: the thing is superfluous, more than necessary, or positively unwanted. Its 'uncalled-for' side lends a critical edge, fitting needless interference or excess.
  こんな余計よけいな機能きのうなんでつけたんだろう。↗

  What did they add this needless function for?
• 無用むようJLPT N1approx.Common
  na-adjective, nounTreats the thing as being of no use: it denies not just need but usefulness or point. It fits talk of something that serves no purpose, where 'pointless' would serve as well as 'needless'.
  あせって仕事しごとを仕上しあげようとすれば、無用むような間違まちがいを犯おかす。↗

  When we rush to complete our work, we make needless errors.

Use 「いらぬ」 for the basic sense of something simply not needed, 不必要 to state neutrally that a thing is unnecessary, 余計 when it is superfluous or unwanted, and 無用 when it is of no use.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• いらぬneedless
• 不必要ふひつようunnecessary
• 余計よけいunnecessary
• 無用むようunnecessary