You see failed vocabulary in the adult world so often, and it's often because once you reach a certain age you're kind of embarrassed to go look up a word if you don't know what it means.
Xenial' is a word which refers to the giving of gifts to strangers. . . . I know that having a good vocabulary doesn't guarantee that I'm a good person. . . . But it does mean I've read a great deal. And in my experience, well-read people are less likely to be evil.