POSITIVE ADJECTIVES STARTING WITH X
Xenial friendly; hospitable.
Xenodochial friendly to strangers or guests.
“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.” ― Lemony Snicket, The Slippery Slope
ps. Take also look of positive verbs starting with x and positive nouns starting with x.