Today my friend Demi [19 year old Lakota girl who I work with] told me that there is no word for "ugly" in Lakota. There are no curse words either. She also taught me how to pronounce the four Lakota values of the YMCA, which are courage, generosity, respect, and wisdom.
http://kalloch.org/lakota__four_values.htm
http://kalloch.org/lakota__four_values.htm