He is trying to improperly influence a witness.

他正试图不适当地影响一名证人。

《柯林斯英汉双解大词典》

Improperly discarded garbage can spread bacteria that are dangerous to health.

不当丢弃的垃圾会传播细菌并有害健康。

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The investors want the bank to buy back any improperly processed loans included in those securities.

VOA: special.2010.10.22

Dr.Nissen points out that many over the counter drugs - aspirin,ibuprofen, acetaminophen or paracetamol - can be toxic if used improperly.

VOA: standard.2010.03.02

Companies can now suffer substantial losses when their products are improperly used even when users are amply warned.

FORBES: Supremely Destructive Stupidity

Those checks did not turn up anything to indicate the burial was done improperly.

CNN: Sheriff: Tamerlan Tsarnaev's burial was handled properly

Improperly filling out a ballot is "the number one way people disenfranchise themselves, " McDonald said.

CNN: In voting, the early bird skips the line