Unerring

Adjective

 * 1) Not missing the target.
 * 2) consistently accurate.
 * 3) * 1717: Hissing in air the unerring weapon flew. -- 's 1697–1700 translation of "The Story of Meleager and Atalanta", in Ovid's Metamorphoses (tr. Garth, Dryden, et al.), book VIII, pub. 1717
 * 4) * 2007, Clive James, Cultural Amnesia, p. 630-1,
 * As the assassination of Sadat proved, the Arab irredentists, like the Zionist ultras, have always been unerring in picking off any incipient mediators.
 * As the assassination of Sadat proved, the Arab irredentists, like the Zionist ultras, have always been unerring in picking off any incipient mediators.

Thesaurus
close, constant, delicate, direct, even, exact, express, faithful, fine, incorrupt, incorrupted, inerrable, inerrant, infallible, mathematical, micrometrically precise, microscopic, nice, pinpoint, precise, refined, religious, religiously exact, rigid, rigorous, scientific, scientifically exact, severe, sinless, square, strict, subtle, sure, uncorrupt, uncorrupted, undebauched, undegenerate, undemoralized, undepraved, undeviating, undissolute, unfallen, uniniquitous, unsinful, unwicked