πενθείω
From LSJ
λογισάμενος ὅτι καὶ ἐκ νεκρῶν ἐγεῖραι δυνατὸς ὁ Θεός → in the belief that God was able to raise him up from the dead
English (Autenrieth)
du. πενθείετον, inf. πενθήμεναι, aor. inf. πενθῆσαι: mourn, mourn for; τινά, Il. 23.283; γαστέρι, ‘by fasting,’ Il. 19.225.
Russian (Dvoretsky)
πενθείω: эп. = πενθέω.