Proclivity (noun)
prok-liv-it-ee
A tendency to choose or do something regularly; an inclination or predisposition towards a particular thing.
Late 16th century from Latin proclivitas, from proclivis ‘inclined’, from pro- ‘forward, down’ + clivus ‘slope’.
Example sentences
“No, you’re single because you wrote ‘proclivity’ in a Valentine’s card!”