Formal:
* Despite his proclivity for solitude, he found himself drawn to the lively social gatherings of his friends.
* Her proclivity for making rash decisions often led to unforeseen consequences.
* The company's proclivity for risky investments ultimately led to its downfall.
Informal:
* He has a proclivity for wearing brightly colored socks.
* My dog has a proclivity for chewing on furniture.
* She has a proclivity for falling in love with the wrong people.
Literary:
* The young artist's proclivity for self-destruction was evident in his chaotic lifestyle.
* The novel explored the protagonist's proclivity for escapism and his desire to find meaning in a world that seemed to offer none.
Remember:
* "Proclivity" refers to a natural tendency or inclination to do something.
* It's often used in a negative or neutral context, but it can also be used positively.
* You can use "proclivity for" or "proclivity to" followed by a noun or verb.