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The word spurious means to be fake.
Not being what it purports to be; false or fake.
Adjective
After receiving a low appraisal on my diamond ring, I realized the suspicious-looking jeweler had sold me a spurious jewel.
The Declaration • September 27, 2018 • https://thedeclarationatcoloniahigh.com/30991/wordoftheday/spurious-2/
Spurious