Every programmer has a primary language that he works with most of the time and is therefore very familiar with.
But there are also languages that you kinda know, in the sense that you used to know them really well in the past, but hasn't used in a while, or that you use them infrequently and therefore are not as immersed in them as you are in your primary language.
You can definitely bring yourself to be productive with these languages, but you might need to re-familiarize yourself a little, look up a few syntax rules, and such. My question is- will you write these languages in your CV as languages you "know"?