[ADJ-GRADED 能被表示程度的副词或介词词组修饰的形容词]和蔼的；温和的；慈祥的 You use benign to describe someone who is kind, gentle, and harmless.
[usu ADJ n]
They are normally a more benign audience...
他们通常观看时比较温和。
Critics of the scheme take a less benign view.
对该方案的批评就没有这么温和了。
benignly
I just smiled benignly and stood back.
我只是和善地笑了笑，站到了后面。
2
[ADJ-GRADED 能被表示程度的副词或介词词组修饰的形容词]没有危害的 A benign substance or process does not have any harmful effects.
[usu ADJ n]
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
[ADJ 形容词]（肿瘤）良性的 A benign tumour will not cause death or serious harm.
[usu ADJ n]
[MEDICAL 医]
It wasn't cancer, only a benign tumour.
这不是癌症，只是良性肿瘤。
4
[ADJ-GRADED 能被表示程度的副词或介词词组修饰的形容词]（条件、环境）良好的，宜人的Benign conditions are pleasant or make it easy for something to happen.
[usu ADJ n]
They enjoyed an especially benign climate...
他们那里的气候非常宜人。
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
[PHRASE 短语]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.
[disapproval]
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。
Oxford
be·nign/bɪˈnaɪn; NAmEbɪˈnaɪn/adjective1( formal) (of people 人)kind and gentle; not hurting anybody 善良的；和善的；慈祥的2( medical 医) (of tumoursgrowing in the body 体内生长的肿瘤)not dangerous or likely to cause death 良性的OPP