I guess I expect the meaning of words and their sound to point in the same direction.
In other words, words that mean pretty should be at least kind of pretty words, nice things to say.
Along comes pulchritude, which means, "physical comeliness."
This doesn't work. If something is beautiful, I will never describe it with such an ugly word (though, it is beautiful in its ugliness).
Much less will I talk about someone's pulchritudeness, nor will I describe what someone getting dressed and getting ready to go out is doing as pulchrifying.
The Merriam-Webster Word of the Day list suggested describing someone's offspring as pulchrous to say that they are fair and beautiful. I don't think so.
As far as I'm concerned, pulchrous is what people who pass gas in the movie theater are.