Nathan laughs when his grandfather describes him as a "cool cat." "That's how we used to describe someone who is neat, pleasing, good," his grandfather says. "Not anymore," Nathan replies. This exchange reminds us that language is _

arbitrary

Explanation:

Arbitrary -

It refers to the absence of any practical or sufficient connection between the meaning of the word and its form or sound , is referred to as an arbitrary .

It is also known as arbitrariness .

The word could be any random word , which does not have any proper sound or sense .

Hence , from the given scenario of the question ,

The correct answer is arbitrary .

answer; i believe that the correct answer is ; the eastern and western churches spoke different languages;

this doesn't support enough information to answer the question.