proneness

1. The quality or state of being prone, or of bending downward; as, the proneness of beasts is opposed to the erectness of man.

2. The state of lying with the face down; -- opposed to supineness.

3. Descent; declivity; as, the proneness of a hill.

4. Inclination of mind, heart, or temper; propension; disposition; as, proneness to self-gratification.

noun

An inclination to something: bent, bias, cast, disposition, leaning, partiality, penchant, predilection, predisposition, proclivity, propensity, squint, tendency, trend, turn. See approach/retreat, like/dislike.

The noun has one meaning:

Meaning #1: being disposed to do something