proclivitas
From LSJ
Sunt verba voces quibus hunc lenire dolorem possis, magnam morbi deponere partem → Words will avail the wretched mind to ease and much abate the dismal black disease.
Latin > English (Lewis & Short)
prōclīvĭtas: ātis, f. proclivis.
I A steep descent, declivity (post-class.): parvulam proclivitatem digressus, Auct. B. Afr. 37.—
II A tendency, disposition, proneness, propensity, proclivity (class.): ad morbos proclivitas...proclivitas ad suum quodque genus, ad aegrotandum proclivitas. Sed haec in bonis rebus facilitas nominetur, in malis proclivitas, ut significet lapsionem, Cic. Tusc. 4, 12, 27 and 28.
Latin > French (Gaffiot 2016)
prōclīvĭtās,¹⁶ ātis, f. (proclivis), pente, descente : B. Afr. 37 || tendance, disposition, penchant naturel [surtout en mauv. part] : Cic. Tusc. 4, 27, et 28.