Definition
Something 'lackluster' is dull, uninspiring, and lacks enthusiasm or vitality. It's like a performance that doesn't quite meet expectations or a party that falls flat. Think of it as the opposite of something exciting or brilliant. If a star athlete has a lackluster game, they don't perform up to their usual standards. It often implies a deficiency in energy, enthusiasm, or brilliance, resulting in disappointment or mediocrity.