incarognirsi

Verb

 * 1) to become worthless, to become a good-for-nothing
 * 2)  to become vile, to become a scoundrel
 * 3) to be or become stubborn or obstinate
 * 4)  to break down, to become difficult
 * 5)  to become chronic
 * 6)  to take root, to become ingrained