assiduity

“Be firm, Herbert,” I would retort, plying my own pen with great assiduity.

And exercising judgement requires a specific set of virtues, the virtues you would hope to find in a jury of your peers: impartiality, assiduity, sincerity.

The House gave him a reference stating that he "acted with a very high degree of professionalism. He showed discretion, loyalty, assiduity and efficiency... there were no disciplinary issues affecting him".

Nadal has always been a modest superstar, avoiding public displays of entitlement with the same assiduity that he arranges the beverage bottles on court in front of his chair.

This was apparently a family that documented events with the assiduity of photojournalists.