Meaning : Making great mental demands. Hard to comprehend or solve or believe.
Example :
A baffling problem.
I faced the knotty problem of what to have for breakfast.
A problematic situation at home.
Synonyms : baffling, elusive, problematic, problematical, tough
Meaning : Highly complex or intricate and occasionally devious.
Example :
The Byzantine tax structure.
Byzantine methods for holding on to his chairmanship.
Convoluted legal language.
Convoluted reasoning.
The plot was too involved.
A knotty problem.
Got his way by labyrinthine maneuvering.
Oh, what a tangled web we weave.
Tortuous legal procedures.
Tortuous negotiations lasting for months.
Synonyms : byzantine, convoluted, involved, tangled, tortuous