How to pronounce“approximativeness”in English

And we've got a lecture there giving a talk. Maybe the talk we just heard. The lady there, with the ear trumpet. Fellow there in the back kinda snoozing. And here's a guy tryingto take notes up in the front. The lecturer says, "There is a cumulative approximativeness, so to speak, a period when the recalcitrant corpuscles begins to--."And the stenographer is thinking, “Confound the fellow! I knew he’d break my pencil with his infernal jaw-smashers!” Jaw-smashers I would like to bring back.