From Longman Dictionary of Contemporary Englishmuzzymuz‧zy /ˈmʌzi/ adjective British English CONFUSEDunable to think clearly, especially because you are ill, sleepy, or drunk Juliet’s head felt muzzy, and she hoped she hadn’t a cold coming on.
Examples from the Corpus
muzzy• She also felt the tiniest bit muzzy and hoped that she hadn't a cold coming on.• Some time during the muzzy fug of these dissipations, a decision had been reached.• Her eyesight was vague and muzzy, her mouth felt like the bottom of a sandpit.• Publicly there were muzzy plans for when the city populations took to the skies enmasse.Origin muzzy (1700-1800) Perhaps from muddled + fuzzy 