muddleheaded
Definitions
Lacking clarity or coherence in thought; confused.
Characterized by a disorganized or muddled state of mind.
Examples
The muddleheaded professor accidentally walked into the wrong classroom and began lecturing on a completely different subject.
After staying up all night studying, I felt far too muddleheaded to make any sense of the complex instructions.
Synonyms
confused befuddled disoriented scatterbrained addled muddled dazed