For the headword adjective (here in the nominative masculine singular) see already under alpha 425.
It occurs in the dative plural in Lycophron, Alexandra 1455. See also Hesychius, Lexicon psi124 (accusative plural, with the same gloss); Greek Anthology 1.106.2; Greek Anthology Appendix, Epigrammata sepulcralia 722.8 (ψ. ἔπος ).
For the verb ψευδηγορεῖν cf. Aeschylus, Prometheus Bound 1032; Aristotle, Rhetoric 1397a17; Philemon fr.102.5 Kock. For the noun ψευδηγορία see Anna Comnena, Alexias 14.9.5; Basil, Epistle 223.1. Even the adverb is attested: Christus Patiens 2326. These words are very common in patristic and Byzantine Greek: see e.g. Irenaeus, Adv. haereses 1.1.20; Nicephorus Gregora, Roman History 3.233.7; George the Monk, Chronicon 413.14, 510.18, 511.22, 512.22.