implacability means the quality or state of being implacable. Lexicurio rates it Sui generis — a strength score of 87 out of 100.
Why “implacability” is a great word
IMPLACABILITY — [Noun] The quality or state of being impossible to placate or appease; unyielding hostility or resentment. From Old French, from Late Latin implācābilitās, from Latin implācābilis ("unappeasable"), from in- ("not") + plācābilis ("easily appeased, placable"). Unlike "obstinacy," which is a general stubbornness of will, or "inexorability," which describes a relentless process, implacability is the cold, human calculus that every olive branch is a ruse and every apology a further insult. It is the iron set of a judge's jaw after a final verdict, the grudge nursed past the grave of its origin, the sea-cliff that receives endless waves without conceding an inch—a human heart having calcified its injury into a permanent feature of the landscape.
noun
- The quality or state of being implacable.