hypocrisy
Meaning: pretending to believe what one does not
Usage: Once the politician began passing legislation that contradicted his campaign promises, his hypocrisy became apparent.
spurious
Meaning: false but designed to seem plausible
Usage: Using a spurious argument, John convinced the others that he had won the board game on a technicality.
apocryphal
Meaning: fictitious, false, wrong
Usage: Because I am standing before you, it seems obvious that the stories circulating about my demise were apocryphal.
fallacious
Meaning: incorrect, misleading
Usage: Emily offered a fallacious argument based on an assumption that was not true.
mendacious
Meaning: having a lying, false character
Usage: The mendacious content of the tabloid magazines is at least entertaining.