Definition of "proneness" [prone•ness]

• The quality or state of being prone, or of bending downward; as, the proneness of beasts is opposed to the erectness of man. (noun)
• The state of lying with the face down. (noun)
• Descent; declivity; as, the proneness of a hill. (noun)
• Inclination of mind, heart, or temper; propension; disposition; as, proneness to self-gratification. (noun)

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• "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."
• "The generalisations of philosophy go to improve our methods so that we may have greater proneness for sense of delight and greater possibility for sense delight."
• "It is a sad fact that, because of comfort, complacency, a morbid fear of communism, and our proneness to ad just to injustice, the Western nations that initiated so much of the revolutionary spirit of the modern world have now become the arch anti-revolutionaries."