The Collaborative International Dictionary of English v.0.48:

Canniness \Can"ni*ness\, n.
   Caution; crafty management. [N. of Eng. & Scot.]
   [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

109 Moby Thesaurus words for "canniness":
   Italian hand, acuteness, animal cunning, art, artfulness, artifice,
   astuteness, austerity, austerity program, cageyness, calculation,
   callidity, care, careful consideration, carefulness, caution,
   cautiousness, chariness, circumspection, cleverness, craft,
   craftiness, cunning, cunningness, deliberate stages,
   deliberateness, deliberation, deviousness, discreetness,
   discretion, economic planning, economicalness, economy,
   economy of means, false economy, fine Italian hand, finesse,
   forehandedness, foresight, forethought, foxiness, frugality,
   frugalness, gamesmanship, gingerliness, good management,
   guardedness, guile, guilefulness, hedge, hedging, heed,
   heedfulness, hesitation, husbandry, ingeniousness, insidiousness,
   inventiveness, judiciousness, low cunning, management, mindfulness,
   one-upmanship, parsimoniousness, parsimony, pawkiness, precaution,
   prior consultation, providence, prudence,
   prudential administration, prudentialness, readiness,
   regardfulness, resourcefulness, safeness, safety first,
   satanic cunning, sharpness, shiftiness, shrewdness, slickness,
   slipperiness, slowness to act, slyness, sneakiness, solicitude,
   sophistry, sparingness, stealth, stealthiness, subtility, subtilty,
   subtleness, subtlety, suppleness, tentativeness, thoroughness,
   thrift, thriftiness, tight purse strings, trickiness,
   uncommunicativeness, unprecipitateness, unwastefulness, wariness,
   wiles, wiliness, wit