/ ˈspjʊəriəs; NAmE ˈspjʊr-/ adjective
1.
false, although seeming to be genuine :
He had managed to create the entirely spurious impression that the company was thriving.
2.
based on false ideas or ways of thinking :
a spurious argument
► spuri·ous·ly adverb
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WORD ORIGIN
late 16th cent. (in the sense born out of wedlock ): from Latin spurius false + -ous .