To mix up, muddle up (one thing with another); to mistake (one thing for another).
to puzzle, perplex, baffle, bewilder (somebody); to afflict by being complicated, contradictory, or otherwise difficult to understand
To mix thoroughly; to confound; to disorder.
To be confused.
To rumple, tousle or make (something) untidy.
A mess (disagreeable mixture or confusion of things; disorder)