1. 和蔼的；温和的；慈祥的
    You use benign to describe someone who is kind, gentle, and harmless.

    e.g. They are normally a more benign audience...
           他们通常观看时比较温和。
    e.g. Critics of the scheme take a less benign view.
           对该方案的批评就没有这么温和了。

2. 没有危害的
    A benign substance or process does not have any harmful effects.

    e.g. We're taking relatively benign medicines and we're turning them into poisons.
           我们服的药相对来说药性温和，但是我们却在把它们变成毒药。

3. （肿瘤）良性的
    A benign tumour will not cause death or serious harm.

    e.g. It wasn't cancer, only a benign tumour.
           这不是癌症，只是良性肿瘤。

4. （条件、环境）良好的，宜人的
    Benign conditions are pleasant or make it easy for something to happen.

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    e.g. They enjoyed an especially benign climate...
           他们那里的气候非常宜人。
    e.g. This plunge came in a time of relatively benign economic conditions.
           这次大跌出现在相对良好的经济环境下。

5. 不作为；善意忽视；顺其自然
    If you describe someone's approach to a problem as one of benign neglect, you disapprove of the fact that they are doing nothing and hoping that the problem will solve itself.

    e.g. America and Japan have settled back into a policy of benign neglect of their currencies.
           美国和日本又回到了不作为货币政策的老路。