ἀνδρὸς σπλάγχνον ἐκμαθεῖν → learn a man's heart, learn a man's inward nature
dēclīvĭtas: ātis, f. declivis,I a sloping place, declivity, Caes. B. G. 7, 85, 4.
dēclīvĭtās,¹⁶ ātis, f. (declivis), pente, penchant : Cæs. G. 7, 85, 4 ; Amm. 23, 6, 65.