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有害無益

harmful and of no benefit

→ 有害だ
phrase Rare #44,275
harmful and of no benefit Describes something that causes harm without providing any benefit.
JA: 夜更かしは体に有害無益です。
EN: Staying up late is harmful and of no benefit to your health.

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.

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.

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.