This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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

n. The state of lying with the face down.

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

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

n. The quality or state of being prone, or of bending downward.

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

n. Descent; declivity.

n. Inclination of mind, heart, or temper; propension; disposition.

n. The state of being prone.

n. The state of bending downward: as, the proneness of beasts that look downward: opposed to the erectness of man.

n. The state of lying with the face or front downward: contrary to supineness.

n. Descent: declivity: as, the proneness of a hill.

n. Inclination of mind, heart, or temper; propensity; disposition: as, proneness to self-gratification or to self-justification.

n. being disposed to do something

"So the study then, you know, the 800 members of the clergy -- nuns, priests, brothers -- were studied, and they were specifically asked about stress, stress being defined as a proneness to depression and anxiety."

supineness   

disposition   

descent    declivity    propension    disposition   

forcefulness    predisposition    hero-worshippers    reification    progressiveness