The F.D.A. almost never does its own testing; that would be impractical and enormously costly.

Given the small target population, these treatments are enormously costly on a per-patient basis.

These forms of protectionism are enormously costly to developing nations, raising prices of some goods by several hundred or even several thousand percent.

There's little justification yet for the enormously costly step of abandoning the use of coal.

Keeping the premature babies alive is enormously costly.

It is enormously costly to keep whole casts and sets at the ready so they can be changed every few nights.

Evolution: The brain is enormously costly to the rest of the body, in terms of oxygen and nutrient consumption.

Enforcement of economic sanctions against white-ruled Rhodesia proved enormously costly.

"It isn't going to work, and it's going to be enormously costly."

It is enormously costly to restore many items precisely as they were, as well as time consuming.