Consistently Inconsistent 

When a person swears they don't routinely change their mind about things and forget to tell you about the changes

Phil: Jason you had asked me to hire subcontractor X
Jason: I did not! There's no way I said that! I want subcontractor Y
Scott to Phil: At least he's consistently inconsistent

Consistently Inconsistent by TerraCon September 19, 2019

Consistently inconsistent 

Florida weather

Florida’s weather is consistently inconsistent; it’ll be raining one second, and then the next it’ll be completely sunny as though it never rained.

Consistently inconsistent by 2020wasbadbad June 21, 2022