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Innocuous means not harmful, and also not meant to upset anyone. A chemical can be innocuous; a joke, a question, or a little habit can be innocuous too. It is a somewhat careful, educated word — teachers, doctors, and news writers use it more than small children do. Though actually, English loves to put in front of it: a innocuous remark looks harmless, and the speaker often wants you to wonder if it is. Do not mix it with innocent. Innocent is about guilt (I did not do it). Innocuous is about harm (this will not hurt / this is not a sharp thing to say).
無害的、無傷大雅的（不是「無辜」；那是 innocent）
組成From Latin innocuus, harmless: in- not, plus a piece about harming. English nocuous (harmful) looks related, but this word was borrowed whole from Latin, not built in English as in- + nocuous.
原始詞典資料2 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
innocuousadj/ɪˈnɒkjuəs/
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Harmless; producing no ill effect.
- With its green cupola or tapering spire, / Which sunset touches with innocuous fire, / The little church appears, to sanctify / The precincts duly where men live and die— [...]
- The shells fell for the most part innocuous; an eyewitness saw children at play beside the flaming houses; not a soul was injured.
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Inoffensive; unprovocative; unexceptionable.
- Ruth Devlin announced that the song must wait, though it appeared to be innocuous and child-like in its sentiments.
- He sat down, and lighted a cigarette, casting about the while for an innocuous topic of conversation.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。