That's a fun problem, here's a half scientific way to solve it: given a dictionary for every pair of languages, the "most succinct word" is the one with the lon

That's a fun problem, here's a half scientific way to solve it: given a dictionary for every pair of languages, the "most succinct word" is the one with the longest definition in other languages. Technical terms like "quantum electrodynamics" are usually imported with minimal changes, and if you ignore foreign words you'll see a lot of languages more or less disappear (cough english cough). My guess is that the most succinct words by this definition would be very specific to a culture, like "fourth amendment" or "Purim Torah".