Adjective
/ˌənˈəriNG/,/-ˈer-/,

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Always right or accurate,
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Always right or accurate
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an unerring sense of direction
Web Definitions:
- inerrable: not liable to error; "the Church was...theoretically inerrant and omnicompetent"-G.G.Coulton; "lack an inerrant literary sense"; "an unerring marksman"
- (unerringly) without making errors; "he unerringly fixed things for us"
- Not missing the target; consistently accurate