The Collaborative International Dictionary of English v.0.48:
agnostical \agnostical\ adj. 1. of or pertaining to agnosticism; agnostic. Syn: agnostic. [WordNet 1.5]WordNet (r) 3.0 (2006):
agnostical adj 1: uncertain of all claims to knowledge [syn: agnostic, agnostical] [ant: gnostic]