ἀδιάβροχος
From LSJ
οὗτος ὁ υἱός μου νεκρὸς ἦν καὶ ἀνέζησεν, ἦν ἀπολωλὼς καὶ εὑρέθη → This son of mine was dead and has come back to life. He was lost and he's been found.
Greek (Liddell-Scott)
ἀδιάβροχος: -ον, ὁ μὴ διαπερασθεὶς ὑπὸ τῆς βροχῆς ἢ τοῦ ὕδατος, παράφρ. Ὀππ. Ἰξ. 2, 1.