expression, noun
light head; vague head; fuzzy thinking
Describes a state of mental cloudiness or inability to think clearly, often from fatigue, illness, or intoxication. The expression is somewhat colloquial.
風邪で濁った頭が働かない。
My head is fuzzy from the cold and I can't think straight.
寝不足で濁った頭のまま会議に出た。
I went to the meeting with a foggy head from lack of sleep.