* Latin: While Latin is still used in some contexts, like the Catholic Church and scientific names, it is not spoken as a native language by anyone.
* Akkadian: This ancient Semitic language was spoken in Mesopotamia and is the language of the earliest known written literature.
* Egyptian: The language of the ancient Egyptians is no longer spoken, but we know a lot about it thanks to hieroglyphs.
* Proto-Indo-European: This is a hypothetical reconstructed language that is believed to be the ancestor of many languages spoken in Europe and Asia.
The term "lost language" is often used to refer to languages that have not been fully documented or understood. These might include:
* Languages of ancient civilizations: There are many ancient civilizations whose languages we know little about, such as the Minoans or the Indus Valley Civilization.
* Languages of isolated tribes: Some languages spoken by small, isolated tribes have not been fully documented before they died out.
It's important to note that even when a language is considered extinct, there can still be traces of it in other languages, in place names, or in cultural traditions.
If you're interested in a specific language, it's best to specify what you are looking for. For example, "What is known about the lost language of the Indus Valley Civilization?"