ADJ.
linguistic, pretentious, silly, unreasonable
noun
An insistence on pure or unmixed forms.
An insistence on the traditionally correct way of doing things.
An example of purist language etc.
I am a staunch supporter of linguistic purism.
Linguistic purism is unreasonable.
Purism is pretentious.
Linguistic purism is a silly idea; compounding, conversion, and derivation can only take you so far.