The Collaborative International Dictionary of English v.0.48:

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

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



The Free On-line Dictionary of Computing (30 December 2018):

CONNIVER

    An artificial intelligence programming language for
   automatic theorem proving from MIT.  CONNIVER grew out of
   PLANNER and was based on coroutines rather than
   backtracking.  It 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)