in the form of a cloud or haze; hazy 云雾状的;朦胧的,模糊的 a giant nebulous glow. 庞大的蒙蒙光辉。 ■(of a concept or idea) unclear, vague, or ill-defined (概念,观点)模糊不清的;混乱的 nebulous concepts like quality of life. 像生活质量这种模糊的概念。 ■another term for nebular 同 nebular
late Middle English (in the sense 'cloudy'): from French nébuleux or Latin nebulosus, from nebula 'mist'. The sense 'cloud-like, vague' dates from the early 19th cent