Synonyms for Fog (same or very similar meaning)
WordNet sense 1 (an atmosphere in which visibility is reduced because of a cloud of some substance):
fogginess, murk, murkinessWordNet sense 2 (confusion characterized by lack of clarity):
daze, hazeWordNet sense 3 (make less visible or unclear):
becloud, befog, cloud, mist, obscure, obnubilate, haze overFrom the ODE community, based on WordNetadd/edit