foggy with thicklow cloud that is difficult to see through. You use foggy especially about low-lying places
a foggy day in London in November
misty with light low cloud that is difficult to see through. You use misty especially about places that are next to water or in the mountains
a cold misty morning
hazy with air that looks cloudy, because there is smoke, dust, or mist in it
hazy sunshine
Examples from the Corpus
cloudy• I'd tell myself that the sky only looked grey because it was really still night-time, not because it was cloudy.• a cloudy day• You can still get sunburnt on a cloudy day.• But the only thing there was a fragilegecko, which clung splay-footed to the wall and watched me with cloudyeyes.• In the partly cloudymoonlight, I checked my watch: 0200.• He looked at the water going cloudypink.• Their eyes met through the cloudyplastic of the window.• He looked around, but the streets were empty, cloudy skies indifferent.• There was one rather cloudy window.