Orcish
Orcish is a harsh, grating language with hard consonants.
The language is very old and originated in the ancient times of the Void. Back in those times the orcs practised a lot of ritual magic and dealt in magic contracts with the devils that they considered their gods. Because of this practise, the Orcs weaved a lot of Infernal into their language.
Since Orcs aren't known for their eagerness to keep records but rather for their lust of conquest and power, there is little to no information available on the original untouched Orcish without its Infernal influence.