@Acer That's a good question. Do you read English books? Chances are that 'Anhedonia' is barely if ever mentioned in there.

How do you learn English? Are you actively reading somewhere (books, social media, television), or do you mainly look in a dictionary?

My idea is, if you know 'Anhedonia', you might be pretty good at English already. ;)

For some English words I still peruse the dictionary (dictionary.com for example), that's fine. That's normal. Even for my own language (Dutch) I use the dictionary sometimes if I encounter a word that I don't know.

The biggest tip I can give is to use the dictionary in the language you want to learn. No translations. And if you encounter a word that you're not sure of in a sentence, just keep on reading. Usually the word becomes clear in context. If at the end of the story you still don't understand that word, you can use the dictionary as mentioned above. This helps you learn the language faster.