unerring

adjective

1. not erring; not going astray or missing the mark: The captain set an unerring course for home.
2. undeviatingly accurate throughout; not containing any error or flaw: She gave an unerring recital of the day’s events.
3. invariably precise or correct: unerring taste.

adjective

1. not missing the mark or target
2. consistently accurate; certain

adj.1640s (implied in unerringly), from un- (1) “not” + gerundive of err. Related: Unerringly.