a. 1. Characterized by collusion; done or planned in collusion. “Collusive and sophistical arguings.” J. Trapp. “Collusive divorces.” Strype. [ 1913 Webster ]
2. Acting in collusion. “Collusive parties.” Burke.
-- Col*lu"sive*ly, adv. -- Col*lu"sive*ness, n. [ 1913 Webster ]