I was listening to an episode of an old-time radio show when I heard them describe a woman in the show as an "ingenue".
It was interesting because it was just quickly said in passing as if this word would be easily understood. The show was from the 1940s.
The only other time I've ever heard or seen was in a song. It was Styx on the Paradise theater album. The song was named "Homewrecker". It's a rocker! You can listen to the song at
https://youtu.be/whzzANKrPos
Ingenue is defined as being "a naive girl or young woman" or "the stage role of a naive girl or young woman".
Fun stuff!
Definition
https://www.merriam-webster.com/dictionary/ingenue