Translation guide
The English word 'innocuous' means not harmful or not likely to cause offense. In Japanese, the most common equivalents are 無害な (mugai na) for physical harmlessness and 当たり障りのない (atarisawari no nai) for inoffensiveness. The choice depends on whether you're talking about safety or social appropriateness.
Describing something that poses no physical danger or health risk, such as a substance, animal, or action.
The most direct and common translation for 'harmless' or 'innocuous' in the sense of not causing physical harm. Used for substances, chemicals, animals, etc.
この化学物質は人体に無害です。
This chemical is innocuous to the human body.
そのヘビは無害な種類だ。
That snake is an innocuous species.
Literally 'without harm', a slightly more colloquial alternative to 無害な. Often used in everyday speech.
この洗剤は環境に害のない成分を使っています。
This detergent uses ingredients that are innocuous to the environment.
Specifically means 'non-toxic'. Use when emphasizing the absence of poison or toxicity.
この植物は毒性のないことが確認されています。
This plant has been confirmed to be innocuous (non-toxic).
Describing remarks, topics, or behavior that are unlikely to upset or provoke anyone.
The most natural way to say 'innocuous' in social contexts. It means 'harmless' in the sense of not causing friction or offense. Often used for comments, questions, or topics.
彼は当たり障りのない話題だけを選んだ。
He chose only innocuous topics.
当たり障りのない返事をしておいた。
I gave an innocuous reply.
Means 'safe' or 'uncontroversial'. Often used for choices or actions that avoid risk or criticism. Slightly more about avoiding trouble than being truly harmless.
無難な選択をする。
Make an innocuous choice.
彼のスピーチは無難な内容だった。
His speech was innocuous in content.
Literally 'not raising corners', meaning not causing offense or friction. A more idiomatic and slightly formal expression.
角の立たない言い方を心がけている。
I try to use innocuous phrasing.
Describing something so ordinary or mild that it doesn't stand out, often with a slightly negative nuance of being boring.
Means 'commonplace' or 'run-of-the-mill'. It implies something is so ordinary that it's innocuous and unlikely to cause any reaction.
彼の答えはありきたりなものだった。
His answer was innocuous (ordinary).
Means 'mediocre' or 'ordinary'. Used when something lacks distinction and is therefore innocuous.
その映画は平凡なストーリーだった。
The movie had an innocuous (bland) story.
無害な is for physical or concrete harmlessness (chemicals, animals). 当たり障りのない is for social harmlessness (remarks, behavior). Using 無害な for a comment would sound odd, as if the comment could physically hurt someone.
この薬は無害です。
This medicine is innocuous (safe).
彼のジョークは当たり障りのないものだった。
His joke was innocuous (inoffensive).
Avoid directly translating 'innocuous' as 無害な in social contexts. It can sound unnatural or overly literal. Use 当たり障りのない or 無難な instead.