WordNet sense 1 (a compound described in terms of the central atom to which other atoms are bound or coordinated):

coordination compound

WordNet sense 2 (a whole structure (as a building) made up of interconnected or related structures):

building complex

WordNet sense 3 (resembling a labyrinth in form or complexity):

labyrinthine, mazy

WordNet sense 4 (having many complexly arranged elements; elaborate):

intricate

WordNet sense 5 (extremely intricate; usually in phrase `Gordian knot'):

Gordian

WordNet sense 6 (complex and ingenious in design or function):

daedal

WordNet sense 7 (consisting of two or more substances or ingredients or elements or parts):

compound, compound

WordNet sense 8 (consisting of separate interconnected parts):

composite

WordNet sense 9 (difficult to analyze or understand):

complicated

WordNet sense 10 (highly complex or intricate):

convoluted, involved, knotty