It would be impossible - the language already contains huge numbers of loan words. All our eating meat words are French for instance (Beef, Mutton, Pork) where

It would be impossible - the language already contains huge numbers of loan words. All our eating meat words are French for instance (Beef, Mutton, Pork) whereas the animal words are "English" (Cow, Sheep, Pig) because the Norman invasion replaced all the old English aristocracy - the commoners raised the animals, the nobles ate them. That was just one conquest and we've had several - the Romans, Celts, Danes etc. To say nothing of important words taken from German, Italian let alone Latin and Greek. That's the reason it's such a mare to learn - it's accepted that we have more words than any other language. There is no such thing as pure English - and a good thing too!