What does it mean if something is described as 'lackluster'?

When something is described as 'lackluster,' it specifically refers to a quality that is dull or lacking in vitality or energy. This term often implies a sense of mediocrity or uninspiring characteristics. For example, a performance deemed lackluster would not engage the audience or exhibit the enthusiasm and energy typically expected. The choice that captures this meaning is aligned with the word's etymology; it combines 'lack' with 'luster,' indicating a deficiency in shine or brilliance. Thus, the description accurately conveys a lack of brilliance or excitement.