The Collaborative International Dictionary of English v.0.48:

Dealing \Deal"ing\, n.
   The act of one who deals; distribution of anything, as of
   cards to the players; method of business; traffic;
   intercourse; transaction; as, to have dealings with a person.
   [1913 Webster]

   Double dealing, insincere, treacherous dealing; duplicity.


   Plain dealing, fair, sincere, honorable dealing; honest,
      outspoken expression of opinion.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Double dealing \Dou"ble deal"ing\, double-dealing
\dou"ble-deal"ing\
   False or deceitful dealing; acting in bad faith; deception by
   pretending to entertain one set of intentions while acting
   under the influence of another. See Double dealing, under
   Dealing. --Shak.

   Syn: duplicity.
        [1913 Webster + WordNet 1.5]