\Col*lu"sive\, a. 1. Characterized by collusion; done or planned in collusion. ``Collusive and sophistical arguings.'' --J. Trapp. ``Collusive divorces.'' --Strype. 2. Acting in collusion. ``Collusive parties.'' --Burke. -- {Col*lu"sive*ly}, adv. -- {Col*lu"sive*ness}, n.