I have to admit that Seny is a tricky word, if you search in Google Translator it would say is Sanity, but I totally disagree with this translation.
In Wikipedia, it translate Seny as form of ancestral Catalan wisdom or sensibleness. It involves well-pondered perception of situations, level-headedness, awareness, integrity, and right action; "a kind of refined good sense and self-realization".
We use it when we have to to decide an important think, we say "Tingues Seny", it could be translate as: "think thoroughly"...
This is the first time I didn't find an exact word to translate a Catalan word to English, but I suppose this is why I started this project, to show the world the Catalan language and all the curiosities about it! ;)