Proclivity

Pro*cliv"i*ty (?), n. [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.