stony-hearted
From LSJ
τὴν πολιὴν καλέω Νέμεσιν πόθου, ὅττι δικάζει ἔννομα ταῖς σοβαραῖς θᾶσσον ἐπερχομένη → I call gray hairs the Nemesis of love, because they judge justly, coming sooner to the proud
English > Greek (Woodhouse)
adjective
P. and V. σχέτλιος, V. ἐκ πέτρας εἰργασμένος, or use V. σιδηρόφρων, Ar. and P. σιδηροῦς; see cruel, relentless.