The Collaborative International Dictionary of English v.0.48:

Conniver \Con*niv"er\, n.
   One who connives.
   [1913 Webster]

The Free On-line Dictionary of Computing (17 December 2009):

CONNIVER

   Artificial intelligence language for automatic theorem
   proving.  An outgrowth of PLANNER, based on coroutines
   rather than backtracking.  Allowed multiple database
   contexts with hypothetical assertions.

   ["The CONNIVER Reference Manual", D. McDermott & G.J. Sussman
   , AI Memo 259, MIT AI Lab, 1973].

   (1995-01-10)


Moby Thesaurus II by Grady Ward, 1.0:

37 Moby Thesaurus words for "conniver":
   Benedict Arnold, Brutus, Judas, Judas Iscariot, Machiavellian,
   Quisling, archtraitor, betrayer, cockatrice, coconspirator,
   conspirator, conspirer, counterplotter, double agent,
   double-crosser, double-dealer, exploiter, finagler, informer,
   intrigant, intriguer, machinator, maneuverer, operator,
   opportunist, plotter, quisling, rat, schemer, serpent, snake,
   timeserver, traitor, treasonist, trimmer, turncoat, wire-puller