Definitions

1. adjective

more foggy; covered or obscured by fog

“The foggier it got, the harder it was to see the road ahead.”

2. comparative

used to compare two things, with the first being more foggy

“London is foggier than Paris in the winter.”

3. superlative

used to compare three or more things, with the first being the most foggy

“This valley is the foggier place I’ve ever been to.”