unerring

unerring
adj.
Not to be avoided: P. and V. ἄ̆φυκτος.
Sure: P. and V. ἀσφᾰλής, βέβαιος.
Well-aimed: V. εὔσκοπος, εὔστοχος.
Truthful: P. and V. ἀψευδής (Plat.).

UNERRING

certus (sure; also of a deity oracle etc. †): qui errare non potest.

unerring: certus: c. Apollo, Hor. Od. 1, 7, 28: certa sagitta, ib. 12, 23: v. INFALLIBLE, TO ERR.