(of a substance) not able to cause illness or death if taken into the body

We should replace the acid with a nonpoisonous substance. 我们应该用无毒物质代替酸。

The lorry was delivering a load of non-poisonous chemicals. 卡车运送的是一车无毒化学品。

(of an animal or insect) not using poison in order to defend itself

Several nonpoisonous snakes live in the forest. 森林里生活着几种无毒的蛇。

Although they are non-poisonous, they can still give you a painful bite. 虽然它们没有毒，但咬你一口仍然可以让你感到疼痛。