(of a person) confused and unable to think clearly because of tiredness, illness, alcohol, or drugs, or (of a situation, plans, etc.) not clear or well explained

Feeling muzzy from the blow on his head, he got up very slowly. 头部挨了一击后感觉昏沉沉的，他动作非常迟缓地站起身来。

Until a week ago, the group's objectives were slightly muzzy. 直到一个星期前，该团体的目标仍不太明确。