Confusually 

the combination of confuse and usally.. when something is usally confusing.

Solving math problems are confusually difficult

Confusually by Crazy Saudi Arabian Students October 31, 2011

confusual 

Something that is confusing as usual

Damn son, that chemistry test was mad confusual.

confusual by Squirmy Anderson February 27, 2008

Confusably 

adj. describing something in such a manner that its comprehension is very limited.

Sally was late to the party because my directions were written confusably.

Confusably by cfmurraytime June 24, 2010