fog

(noun) droplets of water vapor suspended in the air near the ground.

(noun) an atmosphere in which visibility is reduced because of a cloud of some substance. Synonyms: fogginess, murk, murkiness.

(noun) confusion characterized by lack of clarity. Synonyms: daze, haze.

(verb) make less visible or unclear. Synonyms: obscure, befog, becloud, obnubilate, haze over, cloud, mist. Examples: "The stars are obscured by the clouds." "The big elm tree obscures our view of the valley."