Usage: 3 forms in 4 verses
Form Translated As     In Verse(s)
ευπρεπούσ good-looking LXX.Ezek.32.19
ευπρεπείσ for beauty LXX.2Sam.23.1
ευπρεπή his beautiful LXX.Job.18.15
his good-looking LXX.Zech.10.3

Liddell-Scott-Jones

εὐπρεπής (euprepēs) beautiful G:A

εὐπρεπής-ής, ές,

(πρέπω) well-looking, comely, of outward appearance, σχῆμα -έστατον [Refs 5th c.BC+]; [κόσμος] εὐ. [Refs 4th c.BC+]; εὐ. ἰδεῖν fair to look on, [Refs 5th c.BC+]

__2 decent, seemly, ἄνδρα δ᾽ -έστερον (i.e. ἐξελθεῖν ἐστι) [Refs 5th c.BC+]; νόσημα ῥηθῆναι οὐκ εὐ. [Refs 5th c.BC+]; τελευτὴ -εστάτη a most glorious end, [Refs 5th c.BC+]
__3 specious, plausible, opposed to ἀληθής, [Refs 5th c.BC+]; εὐ. δειλία cowardice veiled under a fine name, [εὐπρεπήςεῖ [prev. author] 4.86 ">Refs]; ἐκ τοῦ εὐ. in pretence, [Refs]; τὸ εὐ. τοῦ λόγου, ={εὐπρέπεια}[Refs]
__II adverb -πῶς, Ionic dialect - πέως, οὐκ ἔχειν -έως ἐκλιπεῖν τὴν τάξιν [Refs 5th c.BC+]; with a good pretext, [Refs 5th c.BC+]: comparative - πέστερον [Refs 5th c.BC+]; -πεστέρως [Refs]: superlative - πέστατα [Refs 5th c.BC+]