Proclivity, n.
Etymology: [L. proclivitas: cf. F. proclivité.]
1. Inclination; propensity; proneness; tendency. "A proclivity to steal." Abp. Bramhall.
2. Readiness; facility; aptitude. He had such a dexterous proclivity as his teachers were fain to restrain his forwardness. Sir H. Wotton.