Which 2 European languages have still not been deciphered?

There are no European languages that have not been deciphered. All European languages have been deciphered, though some might be considered more challenging than others due to their complexity or lack of surviving texts.

It's possible you might be thinking of ancient languages like Linear B, which was deciphered in the mid-20th century and is now understood to be the language of the Mycenaean civilization. There are also undeciphered scripts like the Vinča symbols from the Balkans, but these are not considered languages in the same way that modern European languages are.

Let me know if you have any other questions about languages!