The Collaborative International Dictionary of English v.0.48:
Labyrinthian \Lab`y*rin"thi*an\, a. Intricately winding; like a labyrinth; perplexed; labyrinthal. [1913 Webster]WordNet (r) 3.0 (2006):
labyrinthian adj 1: resembling a labyrinth in form or complexity; "a labyrinthine network of tortuous footpaths" [syn: labyrinthine, labyrinthian, mazy]