noun, na-adjective
useless and harmful
A yojijukugo describing something that is not only pointless but also damaging. Often used in formal or critical contexts.
その計画は無益有害だと批判された。
The plan was criticized as useless and harmful.
無益有害な議論を続けるよりも、具体的な解決策を考えよう。
Rather than continuing a useless and harmful debate, let's think of concrete solutions.
A yojijukugo composed of 無益 (useless) and 有害 (harmful). The exact historical origin is uncertain, but it follows a common pattern of combining two two-character compounds to form a four-character idiom.