The state of bending downwards; opposed to the erectness of man.

The state of lying with the face downwards; contrary to supineness.

Descent; declivity; as the proneness of a hill.

Inclination of mind, heart or temper; propension; disposition; as the proneness of the Israelites to idolatry; proneness to self- gratification or to self-justification; proneness to comply with temptation; sometimes in a good sense; as ;the proneness of good men to commiserate want.