implacableness

Touch him there and out jumped jealousy, hate, and implacableness—and all the time one had been thinking of him as a kind of seer!

Until middle life Mr. Cowen was as his father, immovable in principle; afterwards he was as his mother in implacableness.

She is very ill; the worse for some new instances of the implacableness of her relations.

He earned his fame by the energy and implacableness of his hate.

But how, as I said in my former, could I sit down in quiet, when I knew how uneasy their implacableness made you?