Comparative form of 'cloudy'; more covered with clouds, more overcast, or more opaque and less clear.
From 'cloudy' (cloud + -y, meaning 'full of clouds') plus the comparative suffix '-er' (from Old English), making it 'more cloudy.'
The sky goes from clear to cloudier on a predictable scale, but when you get to fully 'cloudy,' it's actually hard to tell just how much cloudier it could get—which is why weather forecasts just give up and say 'mostly cloudy'!
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