WordNet sense 1 (an inclination to do something):

propensity, tendency

WordNet sense 2 (a natural inclination):

proclivity

WordNet sense 3 (the property possessed by a line or surface that departs from the vertical):

inclination, lean, list, tilt

WordNet sense 4 (departing or being caused to depart from the true vertical or horizontal):

atilt, canted, tilted, tipped