IMO, Sunyata should not be translated as "empty." First, it makes us sound like Nihilists, for example, in the Heart Sutra. Secondly, it misleads the new practitioner away from the truer meaning. "It refers to the fact that no thing, including human existence, has ultimate substantiality, which, in turn, means that no thing is permanent and no thing is totally independent of everything else. In other words, everything in this world is interconnected and in constant flux. A deep appreciation of this idea of emptiness thus save us from the suffering caused by our egos, our attachments and our resistance to change and loss"...and gain. What word to use if only one word is to be used" How about sunyata?
I do not recall my source for the quote about the meaning of sunyata but it came with my copy of the Heart Sutra.