Ka vs Kb Weak Acids: Acetic Acid Low Ka, Lower Kb?

[UMath1]

Since Acetic Acid is a weak acid, it has a low Ka which means that the forward reaction is not favored as much as the reverse reaction. However, the Kb is even lower than the Ka...how is this possible? Shouldn't the Kb be higher to indicate that the reverse reaction is favored?

 

[Borek]

Kb is not a property of the acid, but of the conjugate base.