UnNatural Trend In The Natural Products Industry.  “Smiling Faces Sometime Tell Lies.” Mendacious and lying have similar meanings, but the two are not interchangeable.  Mendacious is more formal and literary, suggesting a deception harmless enough to be considered somewhat bland.  Lying is more blunt, accusatory, and often aggressive. You might yell, “You lying rat!” in an argument, but you would most likely stick to the more diplomatic, “Aren’t you being somewhat mendacious?”…