double dealing
Webster's Dictionary (GCIDE)
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]
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]