Prone"ness, n.
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.