1.
harmful, noxious, toxic
Having a bad or damaging effect on health, the environment, or society. Used for substances, organisms, content, and other things that cause harm.
この物質は人体に有害だ。
This substance is harmful to the human body.
有害な排気ガスを減らす必要がある。
We need to reduce harmful exhaust fumes.
インターネット上の有害コンテンツから子どもを守るためのフィルタリングが普及している。
Filtering to protect children from harmful content on the internet is becoming widespread.
USAGE:
Used as a na-adjective (有害な) or as a noun modifier (有害物質). Common in health, environmental, and regulatory contexts. The antonym is 無害 (harmless).
COMMON COLLOCATIONS:
- 有害物質: harmful substance
- 有害廃棄物: hazardous waste
- 有害鳥獣: harmful birds and animals (pests)
- 人体に有害: harmful to the human body
SIMILAR WORDS:
- 無害: harmless (antonym)
- 有毒: poisonous, toxic (stronger, specifically poison)
- 危険: dangerous (broader sense of danger)
Related Words
Antonym:
無害 (harmless)