Comparative form of crude; more unrefined, rough, vulgar, or lacking sophistication than something else.
From 'crude' (Latin 'crudus') with the comparative suffix '-er', used to compare two things or people.
Crude oil gets refined into gasoline—the crude version is 'cruder,' the refined version is 'purified,' which is a perfect metaphor for how the word describes both oil and behavior!
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