The word 'purist' often suggests following rules with no exceptions or modern adjustments. She's such a grammar purist, she corrects text messages.
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Context Sensitivity
A 'purist' may dislike changes in traditional methods, so use the term in relevant historical or cultural discussions. His purist beliefs make him oppose the modern reinterpretations of Shakespeare's plays.
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Cultural Implications
Using 'purist' can carry a judgement; it might imply rigidity or admiration for traditionalism, depending on context. He was a purist in music, insisting on vinyl records over digital formats.