in-,不，非，-noc,伤害，词源同noxious,nuisance.即没有伤害的。

1. It seemed a perfectly innocuous remark.

那像是一句毫无恶意的话。

2. The question appeared innocuous enough, but I still did not trust her.

这个问题看来没什么恶意, 可我仍然不相信她.

3. The liquid looked fairly innocuous.

这种液体看来没什么危险.

4. Even innocuous substances can sometimes register a positive result in a drug test.

即使无害的物质在药物测试中有时也会呈阳性.

5. Both mushrooms look innocuous but are in fact deadly.

这两种蘑菇看起来似乎都无害，实际上却是致命的。