A clever way to slip into a language unnoticed is to sound like a lot of the words already there. This seems to be the case with hazy, which has remained silent about its origins. In entered English in the 16th century, around the time of its rhyme buddies crazy and lazy. Hazy originally characterized a partly obscured atmospheric condition; it still does this, but has branched out to characterize any matter that lacks clearness and definition. The noun haze is a backformation from hazy.