Wily

Antonyms of wily:
artless, obvious, open, patent, plain, public, unconcealed, aboveboard, candid, direct, forthright, frank, honest, natural, outspoken, plainspoken, real, simple, sincere, straightforward, unaffected, unpretending, unpretentious, unvarnished, childlike, impressionable, simpleminded, unsophisticated, unworldly, unforced, unstudied, trustful, trusting, guileless, ingenuous, innocent, undesigning.
Examples of usage:
  1. But to this wily little Frenchman disguise was, as often as not, a common occurrence.
    "My Strangest Case", Guy Boothby.
  2. Wily and uncertain of temper, nervous because of the lightning, the dun- colored cayuse would not let Matthews secure her.
    "The Plow-Woman", Eleanor Gates.
  3. The wily caballero humored her with the most delicate and affectionate attentions.
    "Maximina", Armando Palacio Valdés.