舞蹈不好看怎么说英语

If you think a dance is not aesthetically pleasing, you can say that it is "unattractive" or "not appealing." You could also say that it is "boring" or "uninteresting" if you found it lacking in excitement or novelty. Ultimately, it is a matter of personal preference, so you could simply say that the dance "doesn't appeal to me" or "doesn't suit my taste."