unerring

形容词 unerring:

1. not liable to error
   同义词：inerrable, inerrant

1. You can trust his unerring taste in cloths.
   你可以相信他的衣着品位，绝对没问题。
2. He has an unerring knack of saying the wrong thing.
   他有个出言必失的本领。