I'm stubborn... "Opposite" is too weak a word for my specific need. I much prefer "diametric" but it's an adjective... Can't say "It was the diametry of..." because that word doesn't exist. What I need to say is that something is like the yin to the yang. The absolute opposite, in the most extreme sense. I tried to work out a sentence like "It was the diametric aspect/side/etc of..." But it's not an aspect/side of something if it's really totally diametric, so that doesn't work either. It might work technically but it doesn't satisfy me. I'm sorry if none of this makes any sense, my post would be far too long if I had to present all the background for this question. Isn't there a good, extreme "anti-" word for this? EDIT: Well, I found "antithesis". But this word is restricted to intangible concepts, isn't it?