Their proposals are all worthless and designed out of sinister motives.

他们的建议不仅一钱不值，而且包藏祸心。

《新英汉大辞典》

The reason all this seems so sinister to you is that you are one of the few survivors from the old regime, which means you naturally distrust the team coming in and resent their clannishness.

而所有这些在你看来都如此邪恶，原因是，你是少数几个从旧体制中幸存下来的人之一，这意味着，你必然会不信任新进来的团队，并憎恨他们的帮派行为。

youdao

But even more sinister, the acidity can interfere with basic bodily functions for all Marine animals, shelled or not.

但是更加危险的是，酸度可以干涉所有海洋动物的基本身体机能，不论有壳还是无壳。

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Perhaps most sinister of all, the United States would almost certainly succumb over time to the temptation to dispense with defensive CW training and preparations.

CENTERFORSECURITYPOLICY: Center for Security Policy | Submitted Testimony Of Frank J. Gaffney, Jr. Before A Joint Hearing Of The Senate Governmental Affairs Committee And The Permanent Subcommittee On Investigations

Lurking behind the stark, high-contrast black and white photography ... are the same sinister motivations that have driven all the characters in this master filmmaker's work.

CNN: The experts' 20 best movies of 2009

All of this is sensible, not sinister.

ECONOMIST: Share nonsense