discerning
From LSJ
ἡ δὲ φύσις φεύγει τὸ ἄπειρον· τὸ μὲν γὰρ ἄπειρον ἀτελές, ἡ δὲ φύσις ἀεὶ ζητεῖ τέλος → nature, however, avoids what is infinite, because the infinite lacks completion and finality, whereas this is what Nature always seeks
ἡ δὲ φύσις φεύγει τὸ ἄπειρον· τὸ μὲν γὰρ ἄπειρον ἀτελές, ἡ δὲ φύσις ἀεὶ ζητεῖ τέλος → nature, however, avoids what is infinite, because the infinite lacks completion and finality, whereas this is what Nature always seeks
shrewd: P. and V. συνετός, δριμύς (Plato; Euripides, Cyclops 104), Ar. and P. φρόνιμος.
a discerning mind: V. φρὴν ὠμματωμένη (Aesch., Choephoroe 854).