tortuously
adverb /ˈtɔːtʃuəsli/
  /ˈtɔːrtʃuəsli/
(formal)- (usually disapproving) in a long, complicated way that is difficult to understand; to a degree that is difficult to bear- tortuously long clumsy sentences
- a tortuously slow system
 
- with a lot of bends- The road twists tortuously through the scenic coastal mountain range.