Finnish language
The Finnish grammar and most Finnish words are very different from those in other European languages, because Finnish is not an Indo-European language. The two other national languages that are Uralic languages as Finnish are  Estonian and  Hungarian. Estonians and Finns usually may understand each other, but their languages are very different. Even though Finnish and Hungarian are related languages, they do not look or sound similar. The Finnish and Hungarian languages separated a long time ago, and each language developed its own vocabulary. People who can speak Finnish cannot understand Hungarian without extra study, and Hungarians cannot understand Finnish.  However, there are some basic words that are very similar, for example: 'hand' (Finnish 'käsi' vs. Hungarian 'kéz') 'to go' (Finnish 'mennä' vs. Hungarian 'menni'), 'fish' (Finnish 'kala' vs. Hungarian 'hal').