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有害無益

harmful and useless

→ 有害だ
phrase Rare #40,947
harmful and useless A formal expression meaning that something causes harm while providing no benefit. Often used in writing or serious discussion.
JA: 無理なダイエットは有害無益です。
EN: Extreme dieting is harmful and useless.

テレビは有害無益だと言う人もいる。

Some people say that television is harmful and serves no useful purpose.

この本は君にとって有害無益だろう。

This book will probably do you more harm than good.

喫煙は有害無益であるだろう。

Smoking is probably harmful and offers no benefits.

運動も過度になると有害無益である。

Too much exercise can do more harm than good.