I can not speak most of them. But having friends speak them for years makes you start catching the words, phrases, sentences and even the context though not equally well, not all the time, and not the same for each language - this is for the South Indian languages. I did formally study French and Russian (1 semester). And lol, I took Russian when the USSR still existed :) Those were the days.

Edit - I think I am done. I want to learn Spanish since it will be useful locally, but my brain can not take any more confusion. When you do not use these regularly, but have a faint notion of many many words, the brain does get confused on a regular basis. And I was not trying to brag, expressing helplessness.