Is it even possible to learn exclusively by immersion as an adult? I was under the impression that roughly around puberty, we lose a good part of our ability to just pick up languages and a combination of study and experimentation was required afterwards.
I've learnt so much more from studying conjugation/declension tables on Wiktionary than I have from trying to converse with fluent/native speakers, who can't explain to me why or tell me how to spell it (sounding/typing it in the English alphabet).