casuist
Concise Oxford English Dictionary © 2008 Oxford University Press:
casuist /ˈkazjʊɪst, -ʒj-/
▶noun a person who uses clever but false reasoning.
– derivatives
casuistic adjective,
casuistical adjective,
casuistically adverb,
casuistry noun.
casuistic adjective,
casuistical adjective,
casuistically adverb,
casuistry noun.
'casuist' also found in these Oxford entries:

