unerring
1. [ adjective ] not liable to error
Synonyms: inerrant inerrable
Examples:

"the Church was...theoretically inerrant and omnicompetent"-G.G.Coulton "lack an inerrant literary sense" "an unerring marksman"

Related terms: infallible
Similar spelling:   unerringly
  unhearing
  unwearying
  Unrein
  unwronged
  unremitting
  unoriented
  unrimed
  unwarranted