perseveringly

The duty of rulers should be perseveringly set before them, and the minds of all assiduously called to reflection.

The purpose was to deceive, and it was the more censurable for being so deliberately premeditated and so perseveringly practised.

Still, he was more active, more perseveringly energetic, more effective than ever before.

He sat there and drilled and drilled and drilled perseveringly until he had a hole down deep enough for the blast.

He is hunted very perseveringly on account of the devastation he causes among the sugar-canes.