to "spurn" means to reject. So you SPURn anything that is SPURious (false).
The polka dotted sponges in the aquarium were not the real, rare ones living in the ocean. They were fake.
Split "Spurious" into spur+ious, where spur means instantly(spur of the moment). So anything done without much thought and immediately can result in falsehood or may be illogical.
you get furious when you get spurious (counterfeit)dollar bills
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