For a discussion I'm having with a colleague, we're trying to think of complimentary words that sound ugly.
Any that rhyme with chunky (or anything else for that matter).
It sounds horrible (to me, at least) - but means beauty (see also: pulchritudinous).
As for complimentary words that sound rhyme with chunky: how about "funky"?
EDIT: Definition of funky.
I've always thought this was a stupid-sounding word, although young women seem enamored of it to describe their boyfriends.
For that matter, I can't think of much that's more pleasant or beautiful than a girl, but the word "girl", with its initial gutteral, consecutive liquids, and complete lack of a true vowel, is not among the most beautiful of words.
That was the first word that came to mind when I read the question.
Here are results from a rhyming dictionary:
My, this seems like the kind of site I could have spent a lot of time answering questions on!