ἄτηκτος
From LSJ
ὥσπερ ἀνέµου 'ξαίφνης ἀσελγοῦς γενοµένου → just as when a wind suddenly turns foul, just as when a wind suddenly turns nasty
English (LSJ)
ον,
A not melted or to be melted by fire, χιών Pl.Phd.106a; ἄ. πυρί Arist.GA762a31, cf. Mete.388b24. 2 insoluble in oil, Dsc. 5.160. II metaph., not to be softened or subdued, νόμοις ἄτηκτοι Pl.Lg.853d.