Definitions:

1. Describes something resembling a labyrinth. ADJECTIVE
   • The labyrinthian corridors of the ancient castle made it easy to get lost.
2. Difficult to understand due to intricate details or convoluted structure. ADJECTIVE
   • His argument was so labyrinthian that few could follow his reasoning.

Synonyms:

• complex
• complicated
• intricate
• involved
• labyrinthine
• mazy