κακόγλωσσος
From LSJ
ὅπου ἡ λεοντῆ μὴ ἐφικνεῖται, προσραπτέον ἐκεῖ τὴν ἀλωπεκῆν → if a lionskin doesn't do the trick, put on the fox | if force doesn't work, try cunning | where the lion's skin will not reach, it must be patched out with the fox's
English (LSJ)
ον,
A ill-tongued, βοὴ κ. a cry of misery, E.Hec.661. II bringing evil [on oneself] by one's tongue, of Niobe, Call.Del.96.
German (Pape)
[Seite 1299] von böser, Unglück redender Zunge; βοή, Unglücksklagen, Eur. Hec. 661; Νιόβη, die zu ihrem Unglück gesprochen, Callim. Del. 96; Sp.
Greek (Liddell-Scott)
κᾰκόγλωσσος: -ον, κακόγλωσσος βοή, κραυγὴ δυστυχίας, Εὐρ. Ἑκ. 661. ΙΙ. ἐπιφέρων κακὸν (εἰς ἑαυτὸν) διὰ τῆς γλώσσης του, λαλῶν πρὸς ἰδίαν αὑτοῦ βλάβην, ἐπὶ τῆς Νιόβης, Καλλ. εἰς Δῆλον 96.