Ah, the perils of learning words from reading only.
All this time, I've been pronouncing "inexorable" in my head as "in-ig-ZOR-a-bal", when apparently, it's "in-EKS-er-a-bal".
The clue was seeing it written in the Shaw Alphabet Edition of Androcles and the Lion, which uses phonemic (more or less) spelling.
It did make me check the dictionary, though, to see whether my pronunciation was simply wrong or an alternative. Nope, apparently it's just wrong. Who knew.