If you describe someone's judgment or ability as unerring, you mean that they are always correct and never mistaken.
例句
These designs demonstrate her unerring eye for colour and detail...這些設計體現了她對顏色和細節的精準眼光。Paul is a thoroughly likeable man with an unerring sense of comedy...保羅十分討人喜歡，開玩笑時很有分寸。
英漢詞典釋義
adj.
準確無誤的;無偏差的
He had an unerring instinct for when people were lying to him.他具有準確的直覺，能判斷別人什么時候是在說謊。
一貫正確的;可靠的
adv.
英英詞典釋義
Adjective
1. not liable to error;
"the Church was...theoretically inerrant and omnicompetent"-G.G.Coulton"lack an inerrant literary sense""an unerring marksman"