Febrile is not a word I have ever used. I saw it in an article I was reading, and it jumped off the page at me. Not literally, of course.
Since I just learned it, I thought you might like to also.
Ferbrile means marked or caused by fever or being feverish.
It can also me having or showing the symptoms of a fever.
Additionally, the word febrile is used to describe someone who is having or showing a great deal of nervous excitement or energy.
The source of the word is Medieval Latin. febrilis, from Latin febris fever
It was first used around 1651.