spurious
SPYOOR-ee-usadjMeaning false, though made to look true or real
Memory hook SPY-YOUR-ious: a SPY in a fake mustache. The spy’s mustache looks real from far away, but up close it is glued on and false. His disguise is spurious.
The ad made spurious claims that the cream would make anyone look twenty years younger.
In context Ivy’s argument sounded convincing at first, but its reasoning was spurious: she had picked out three rainy Mondays and claimed that it always rains on Mondays.
Similar fake, false, phony, sham
Opposite genuine, real, true
From Latin spurius, “false, not genuine.”