Infelicitous, Infelicity is a term used by John L. Austin to denote the way in which a sentence other than a constative one (a sentence that makes sense to ask whether it is true or false) is inappropriate, undirected, or absurd.
If I say that Thomas Jefferson was the first president of the United States, my sentence is incorrect (because this sentence is ascertaining), but if on March 28, 2022. I say that I promise to meet you on March 26, 2022, my sentence is not false, but Infelicitous.
So when a sentence expressing a promise, vow, etc., is said wrong, it is Infelicitous rather than false.
