Never understood why the arian particle can’t just be dropped. Same deal for the horribly unwieldy (but genuinely useful) authoritarianism, whose French equivalent is the more elegant autoritarisme.

English is an ugly messy language. There, I said it.

Really though, antidisestablishmentarianism is the opposition to the disestablishmentarianist beliefs of presbyters.

In other words, its a conservative, counter-reformationist movement, not a belief in itself.