ἀνείκαστος
From LSJ
ἡ Νέμεσις προλέγει τῷ πήχεϊ τῷ τε χαλινῷ μήτ' ἄμετρόν τι ποιεῖν μήτ' ἀχάλινα λέγειν → Nemesis warns us by her cubit-rule and bridle neither to do anything without measure nor to be unbridled in our speech
English (LSJ)
ον,
A unattainable by conjecture, immense, βοή LXX3 Ma. 1.28; πλῆθος Ps.-Callisth.3.20; incomparable, στρατιώτης Polem. Call.50; f.l. for ἀνήκεστος, D.8.46. II incapable of artistic representation, D.Chr.12.59.