brainwork

“The amount of literal brainwork needed to do his job too such a toll on him that it sent him to an early grave,” Goode says.

Beauty can't amuse you, but brainwork—reading, writing, thinking—can.

No amount of brainwork has conjured any sense from Iffley, and the etymology has been placed on the shelf as “unknown”.

And this may confidently be said: There is “fundamental brainwork” in every article that De Quincey has written.

This is stiff brainwork for a time—stiff because the brain must be mastered.

Get Dilly to make you that boiled rice every night after your brainwork.

And even then he will sometimes say, "How about the brainwork?"