The term "ineffable", meaning inexpressible, transcending description, beyond the scope of our human concepts, is good semantic currency with a respectable Latin lineage. But today, because of such similar-sounding but very different-meaning words and phrases as "effing" and "the eff word", we may well be slightly uncomfortable with "ineffable" and ready for an alternative. I suggest "transcategorial", that is, outside or beyond the range of our categories of thought, and I shall use both terms in what follows.