being disposed to do something; "accident proneness"
The state of lying with the face down; -- opposed to supineness.
Descent; declivity; as, the proneness of a hill.
Inclination of mind, heart, or temper; propension; disposition; as, proneness to self-gratification.
n. State of bending downwards -opposed to erectness;-state of lying with the face downwards - opposed to supineness ; descent ; declivity ;-inclination of mind, heart, or -temper ; propension ; disposition.