Words

Here is a marvelous website --
http://www.drtimlomas.com/positive-lexicography.

It welcomes the visitor thusly:

Welcome to the positive lexicography, an evolving index of 'untranslatable' words related to wellbeing from across the world's languages. 

Excellent.

I hardly know which word to pick.

Let us start with this:

Nam jai (น ้ำใจ) (Thai, n.): lit. 'water from the heart', selfless generosity and kindness

We shall try.