I detect an undercurrent of resentment towards the new proposals.

我察觉到对新提案有一股潜在的不满情绪。

《牛津词典》

There was an undercurrent of antipathy between them.

他们两人之间潜伏着一股反感的暗流。

youdao

There's still an undercurrent of anger to his voice.

仍然有对他的声音忿怒的一个下面的水流。

youdao

There's always been an undercurrent in this country that if you're poor, it's your fault.

NPR: 12 min 17 sec

So possibly there was an undercurrent of commonness between the faiths that we deny today.

BBC: The foreign Hindu monks at India's Kumbh Mela

He's done his best to liven things up, creating an undercurrent of suspense and some dynamic interactions.

WSJ: Review: Revival of Gurney's 'Old Boy' well-staged