She has an unerring instinct for people's weak spots.

她对人们的弱点有着从不出错的直觉。

《柯林斯英汉双解大词典》

She had an unerring instinct for a good business deal.

她有天生擅长做生意的本事。

《牛津词典》

He had an unerring instinct for when people were lying to him.

直觉，能判断别人什么时候是在说谎。

youdao

And Mr Djukanovic is a phenomenally clever politician, with an unerring instinct for survival.

ECONOMIST: A minnow emerges

When the Germans occupied the city in 1939, Nazi officers, with their unerring instinct for such things, seized the huge home, and made baleful use of it until the end of the war.

NEWYORKER: Broken Record