Source : Webster's Revised Unabridged Dictionary (1913)

Casuist \Cas"u*ist\, n. [L. casus fall, case; cf. F. casuiste.
   See {Casual}.]
   One who is skilled in, or given to, casuistry.

         The judment of any casuist or learned divine concerning
         the state of a man's soul, is not sufficient to give
         him confidence.                          --South.

Casuist \Cas"u*ist\, v. i.
   To play the casuist. --Milton.

Source : WordNet®

casuist
     n : someone whose reasoning is subtle and often specious [syn: {sophist}]