τριαυγής
From LSJ
ὃν οὐ τύπτει λόγος οὐδὲ ῥάβδος → if words don't get through, neither a beating will | if the carrot doesn't work, the stick will not work either | whom words do not strike, neither does the rod
Greek Monolingual
-ές, Α
αυτός που έχει τριπλή λαμπρότητα.
[ΕΤΥΜΟΛ. < τρι- + -αυγής (< αὐγή), πρβλ. τετρ-αυγής].