He watched her balefully.

他看着她，眼露恶意。

《柯林斯英汉双解大词典》

It was also - as the site says, balefully glaring at me - an experiment to see how much of this stuff would work for me.

就像网上所说的，一项实验正紧紧地盯着我，看我这个网站是如何为我工作的。

youdao

Gone are the days when dining in Prague meant gawping balefully at plates of stodgy dumplings.

BBC: Budget and blowout guide to Prague

Manuel stared balefully at us from his perch in the kitchen, saying nothing.

CNN: Doomed Love At The Taco Stand

In that instance it was young loyalists who were so balefully xenophobic.

ECONOMIST: Northern Ireland