Finding synonyms for the word "louty" might not be an easy task, as it is not a very common word. However, some possible alternatives to describe someone or something that is clumsy, boorish or ill-mannered include "uncouth," "coarse," "uncivilized," "barbaric," "rough," "vulgar," "inelegant," "unrefined," and "crude." Additionally, other related words that could apply in certain contexts could be "rowdy," "loud," "obnoxious," "unruly," "disruptive," or "tactless." Depending on the specific situation or tone, some of these synonyms could convey different nuances and connotations, so it is important to choose the most appropriate one.