An "ugly dress" is a term used to describe an article of clothing that is considered unattractive, unfashionable or poorly designed. It may be made from cheap materials, have an unflattering cut or print, or simply not fit the current fashion trends. The phrase can also refer to any outfit that is worn by someone who does not typically follow fashion norms or has a unique sense of style. Ultimately, whether something is considered "ugly" is subjective and depends on individual tastes and preferences.