ἀτρεμία
From LSJ
εἰρήνη ἡ ὑπερέχουσα πάντα νοῦν → peace that surpasses all understanding
English (LSJ)
ἡ,
A keeping still, ἀτρεμίαν ἔχειν X.Cyr.6.3.13, cf. Max.295; ἀ. λιμένων AP9.555.6 (Crin.); ἐν ἀτρεμίᾳ Cerc.5.7: pl., Arist.HA537a4. 2 intrepidity, Pi.N.11.12.