implacableness

But in China there’s an air of trust and implacableness about them.

The quality or state of being bitter, sharp, or acrid, in either a literal or figurative sense; implacableness; resentfulness; severity; keenness of reproach or sarcasm; deep distress, grief, or vexation of mind.

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

An ancient people which subsists by subtlety and courage, has the heroic sense of high tradition, still looks forward to efface, not the indignity of days, but of centuries—which imparts to the Jew a lofty implacableness of aim, which never pauses in its purpose.

Christ died to expiate thy wrath, hatred, and enmity; to atone for thy bitterness and rancor, for thy love of revenge, and the implacableness of thy spirit.