Lexical Definition

‎ἀψευδής‎ apseudḗs (aps-yoo-dace') not a liar ^G:A
from ‎Α‎ (as a negative particle) and ‎ψεῦδος‎

that cannot lie.

• veracious

Abbott-Smith

** ἀ-ψευδής, -ές (< ψεῦδος), [in LXX: Wi 7:17*;]
free from falsehood, truthful: Tit 1:2.†

Abbott-Smith References

Liddell-Scott-Jones

ἀψευδής-ής, ές,

without deceit, truthful, especially of oracles and the like, [Refs 8th c.BC+]; μάντις ἀ., of Apollo, [Refs 5th c.BC+]; θεός[NT]; ἀψευδήςεῖ τέχνῃ, of augury, [Refs 5th c.BC+]; unerring, [Refs 5th c.BC+]

__2 of things, uncorrupt, pure from all deceit, ἀ. πρὸς ἄκμονι χάλκευε γλῶσσαν[Refs 5th c.BC+]
__3 ἀψευδήςής, ={κώνειον}, Ps.-[Refs 1st c.AD+]
__II adverb -δέως, Attic dialect-δῶς, really and truly, οἱ ἀ. ἄριστοι[Refs 5th c.BC+]: superlative -έστατα, ἐρεῖν[Refs 1st c.AD+]

_{LSJ Scripture Refs: Titus.1.2}