foggy

Concise Oxford English Dictionary © 2008 Oxford University Press:
foggy/ˈfɒɡi/

▶adjective (foggier, foggiest)

• 1 full of or accompanied by fog.

• 2 confused.

– phrases
not have the foggiest (idea or notion) informal, chiefly Brit. have no idea at all.

– derivatives
foggily adverb,
fogginess noun.

– origin C15: perh. from fog2.