NEBULOUS Meaning of NEBULOUS in English [neb.u.lous] adj [L nebulosus misty, fr. nebula] (1784) 1: of, relating to, or resembling a nebula: nebular 2: indistinct, vague -- neb.u.lous.ly adv -- neb.u.lous.ness n Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012