unerring
adj. 无过失的；不犯错误的；没有打歪的
例句
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》
The wise, unerring Faria could not be mistaken in this one thing.
聪明的法利亚从来没算错过一件事，他不会单单在这件事上弄错的。
