Undulating: Well, now, that's just a fun word, isn't it? I am afraid of eels and anemones and sea things that undulate. I don't mind strobe lights, though. So now you know. (do you like how I stopped saying u for you? Me too).
Umpteenth: I really like this word, but V prefers googol or googolplex. I try to explain to her that googol is now Google and so no longer means what she thinks it means, but she doesn't listen to me. I also like words like eleventeen, lots and lots, and boatloads. I especially like those words when they pertain to cream cheese based food, or time off from work.