a language you don't absolutely need and are also relatively uninterested in.

Outside of my mission language, I was required to learn three. I only really wanted to learn one of them. The only one I really learned to a professional proficiency was the one I really liked, and I learned it in my 40s, when it was much harder to learn.

The other two I learned in my 20s and 30s when language learning was not as difficult, and I never really got to full professional proficiency in either one.