Relentless vs Barbarous - What's the difference?

As adjectives the difference between relentless and barbarous

is that relentless is unrelenting or unyielding in severity while barbarous is not classical or pure.

(en adjective)

Unrelenting or unyielding in severity

Unremitting, steady and persistent

* relentlessness

* (obsolete) barbarouse

(en adjective)

Not classical or pure.

uncivilized, uncultured

Like a barbarian, especially in sound; noisy, dissonant.

I did but prompt the age to quit their cloggs

By the known rules of antient libertie,

When strait a barbarous noise environs me

Of Owles and Cuckoes, Asses, Apes and Doggs - (1673)

* barbarously * barbarousness