ἀνδρὸς σπλάγχνον ἐκμαθεῖν → learn a man's heart, learn a man's inward nature
adj.
P. ἄοπλος, P. and V. γυμνός, ψιλός, V. ἄσκευος, ἀτευχής, ἀσίδηρος (Eur., Bacch. 736).