fog·gy / ˈfôgē; ˈfägē/ • adj. (fog·gi·er, fog·gi·est) full of or accompanied by fog: a dark and foggy night. ∎ unable to think clearly; confused: she was foggy with sleep. ∎ indistinctly expressed or perceived; obscure: exactly what the company hopes to achieve is still foggy.PHRASES: not have the foggiest (idea or notion) inf. have no idea at all.DERIVATIVES: fog·gi·ness n.