Lexical Definition

‎ψευδής‎ pseudḗs (psyoo-dace') false ^G:A
from ‎ψεύδομαι‎

false, liar.

• untrue, i.e. erroneous, deceitful, wicked

Abbott-Smith

ψευδής, -ές (< ψεύδομαι), [in LXX for שֶׁקֶר, שָׁוְא, כָּזָב; etc. ;]
lying, false, untrue (of persons and things): Re 2:2; μάρτυρες, Ac 6:13; as subst., ὁ ψ., a liar: Re 21:8.†

Abbott-Smith References

Liddell-Scott-Jones

ψευδής, ές

(the neuter singular ψευδές is not found in early writers, ψεῦδος being used instead, compare ψεῦδος 111; it is found in later Gr., [Refs 1st c.AD+]; old Attic dialect accusative plural ψευδᾶς [Refs]: (ψεύδομαι):— lying, false, untrue, of things, opposed to ἀληθής, ψ. λόγοι [Refs 8th c.BC+]; τρέπεσθαι ἐπὶ ψευδέα ὁδόν to betake oneself to falsehood, [Refs 5th c.BC+]; ψ. κατηγορία, αἰτίαι, false charges, [Refs 5th c.BC+] are also fallacies, in Logic, [Refs 4th c.BC+]; ἥδε ἡ ψ. οὐσία this unreal Being (i.e. the world of sense), [Refs 3rd c.AD+]: irregular superlative ψευδίστατος, εἴδη [Refs 2nd c.AD+]

__2 of persons, lying, false, and as substantive, liar, οὐ γὰρ ἐπὶ ψευδέσσι πατὴρ Ζεὺς ἔσσετ᾽ ἀρωγός [Refs 8th c.BC+]; perhaps ψεύδεσσι from ψεῦδος[Refs 5th c.BC+]; ψ. φανήσεσθαι to be detected in falsehood, [Refs 5th c.BC+]: irregular superlative ψευδίστατος arrant liar, [Refs]
__3 τὰ ψευδῆ falsehoods, lies, οὐ ψευδῆ λέγω [Refs 5th c.BC+]
__4 ψευδέων ἀγορή, in [Refs 5th c.BC+]. ή, ιβ, said to be a name of the monkey-market, perhaps as being villanous counterfeits of humanity.
__II passive, beguiled, deceived, [Refs 5th c.BC+]
__III adverb ψευδῶς falsely, λέγειν [Refs 5th c.BC+]; mistakenly, ψ. δοξάζειν [Refs 5th c.BC+]groundlessly, [Refs 2nd c.BC+]