¦ adjective
1. [often in combination] likely or liable to suffer from, do, or experience (something unfortunate): accident-prone|farmed fish are prone to disease.
2. lying flat, especially face downwards.
with the palm of the hand facing downwards.
3. archaic with a downward slope or direction.
Derivatives
proneness noun
Origin
ME: from L. pronus 'leaning forward', from pro 'forwards'.