proclivity
/pɹoʊˈklɪvəti/noun
A natural tendency to behave in a particular way or to like a particular thing.
Example sentences
- “She has a proclivity for staying up late and sleeping in.”
- “The boy's proclivity for climbing trees worried his mother.”
Formal, and often for questionable tastes: 'criminal proclivities'. 'Tendency' is the neutral everyday choice.