It's Merriam Webster's word of the day for July 13th.

Today's word is implacable, spelled I-M-P-L-A-C-A-B-L-E.

Implacable is an adjective.

Someone or something described as implacable is not capable of being appeased or changed. Here's the word used in a sentence from the economist.

Unlike, say, the globetrotting stories of Ian Fleming or John Le Corray, in which victories

only temporarily frustrate an implacable

foe, Agatha Christie's smaller worlds feel put right when the cover closes or credits roll.

Implacable is rooted in the Latin verb placare, meaning to soothe. But its M-I-M prefix is a variant of the negating prefix

in I-N, as in inactive. And it signals that there's nothing warm and fuzzy here. Someone or something

described as implacable cannot be soothed, which usually means trouble.

Implacable is most often attached to words like foe, enemy, hatred, and hostility.

The opposite of implacable, of course, is placable. It means easily soothed, but sadly isn't

called upon very often.

Another placaray word is likely more familiar.

Placate means to soothe or appease.

It's frequently applied when an angry person is made to feel less so.

With your word of the day, I'm Peter Sokolowski.

Visit Mary Gilles. So with your word of the day, I'm Peter Sokolowski. Visit Miriamwebster.com today for definitions, wordplay, and trending word lookups.