The Collaborative International Dictionary of English v.0.48:
Casuistic \Cas`u*is"tic\, Casuistical \Cas`u*is"tic*al\, a. Of or pertaining to casuists or casuistry; as, casuistic thinking. [1913 Webster]WordNet (r) 3.0 (2006):
casuistical adj 1: of or relating to or practicing casuistry; "overly subtle casuistic reasoning" [syn: casuistic, casuistical] 2: of or relating to the use of ethical principles to resolve moral problems [syn: casuistic, casuistical]