Adjective

(-)

Not missing the target.

consistently accurate.

* 1717:' Hissing in air the '''unerring weapon flew. -- (John Dryden)'s 1697–1700 translation of "The Story of Meleager and Atalanta", in Ovid's ''Metamorphoses (tr. Garth, Dryden, et al.), book VIII, pub. 1717

* {{quote-book

, year=1960 , author= , title=(Jeeves in the Offing) , section=chapter III , passage=One learns, as one goes through life, to spot goofiness in the other sex with an unerring eye [...]}}

* 2007 , , 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.

Adjective

(en adjective)

unique, such that it cannot be mistaken for something else.

* 1895 , H. G. Wells, The Time Machine Chapter X

Now, I still think that for this box of matches to have escaped the wear of time for immemorial years was a strange, and for me, a most fortunate thing. Yet oddly enough I found here a far more unlikely substance, and that was camphor. I found it in a sealed jar, that, by chance, I supposed had been really hermetically sealed. I fancied at first the stuff was paraffin wax, and smashed the jar accordingly. But the odor of camphor was unmistakable .