無 害(むがい)

むがい

noun, na-adjective

harmless; innocuous; nontoxic

science health

1. harmless; innocuous; nontoxic

Causing no harm, injury, or damage. Used for substances, animals, actions, or people that pose no danger.

この虫(むし)は無害(むがい)です。

This insect is harmless.

人体(じんたい)に無害(むがい)な成分(せいぶん)で作(つく)られている。

It is made from ingredients that are harmless to the human body.

この化学物質(かがくぶっしつ)は環境(かんきょう)に無害(むがい)であることが実験(じっけん)で確認(かくにん)されている。

It has been confirmed through experiments that this chemical substance is harmless to the environment.

A compound of 無(む) (without; non-) and 害(がい) (harm; damage). Functions as a na-adjective with な (e.g., 無害(むがい)な) and as a noun. Commonly used with に to specify what something is harmless to.

Common collocations

人体(じんたい)に無害(むがい): harmless to the human body
環境(かんきょう)に無害(むがい): environmentally harmless
無害(むがい)な物質(ぶっしつ): a harmless substance
無害(むがい)な生物(せいぶつ): a harmless organism
無害(むがい)化(か): rendering harmless; detoxification

Similar words

有害(ゆうがい): harmful; toxic — the direct antonym
安全(あんぜん): safe — broader term covering freedom from all danger, not just absence of harm
無毒(むどく): nontoxic; nonvenomous — specifically about absence of poison or venom

Related Words

Antonym: 有害(ゆうがい) (harmful)

Compare: 安全(あんぜん) (safe)

Compare: 無毒(むどく) (nontoxic)

general

Added 2026.4.25 23:15 · Revised 2026.9.2 13:02

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