Origin of Nebulous
From Middle English, from Latin nebulōsus (“full of mist, foggy, cloudy"), from nebula (“mist, vapour, cloud"), from Proto-Indo-European *nébÊ°os (“cloud, vapor, fog, moist, sky"). Cognate with Ancient Greek νέφος (néphos, “cloud"), Old High German nebul (“cloud, fog") (German Nebel), Old English nifol, neowol (“dark, gloomy, obscure, precipitous, prone"). More at neveling, nuel.
Middle English from Latin nebulōsus from nebula cloud nebh- in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition
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