goodness knows
idiomPart ofgoodness
goodness knows — idiom
1. used to emphasise that you do not know something, or to add force to a statement
1.idiom
Definition
used to emphasise that you do not know something, or to add force to a statement
Example
Goodness knows where Aylin left her keys — she has searched the whole house.
Goodness knows we have tried everything to fix this old car.