relentlessness

She had softened perhaps from her yesterday's relentlessness.

How could he stand there so like a machine in his relentlessness?

She felt oppressed by the hardness, the 136 relentlessness, of his words, his manner.

Mr. Reade traces their history with all the relentlessness of the genealogist.

And this one, though not so powerful, frightened me the more in his relentlessness.

Honor had been fearing that the war would, in its relentlessness, claim him also.

So that his relentlessness towards Magda was the more inexplicable.

Burke confronted Jacobinism with the relentlessness of a Jacobin.

Then it was that the cruelty of the sea, its relentlessness and awfulness, rushed upon me.

He marvelled at the subtlety of her mind, and she at the relentlessness of his.