The Collaborative International Dictionary of English v.0.48:

Wary \Wa"ry\, a. [Compar. Warier; superl. Wariest.] [OE.
   war, AS. w[ae]r; akin to Icel. v?rr, Dan. & Sw. var, Goth.
   wars, G. gewahr aware, OHG. wara notice, attention, Gr. ? to
   see. Cf. Aware, Garment, Garnish, Garrison,
   Panorama, Ward, v. t. Ware, a., Warren.]
   [1913 Webster]
   1. Cautious of danger; carefully watching and guarding
      against deception, artifices, and dangers; timorously or
      suspiciously prudent; circumspect; scrupulous; careful.
      "Bear a wary eye." --Shak.
      [1913 Webster]

            We should be wary, therefore, what persecution we
            raise against the living labors of public men.
                                                  --Milton.
      [1913 Webster]

   2. Characterized by caution; guarded; careful.
      [1913 Webster]

            It behoveth our words to be wary and few. --Hooker.
      [1913 Webster]

   Syn: Cautious; circumspect; watchful. See Cautious.
        [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Warye \War"ye\, v. t. [AS. wergian, wyrgean. Cf. Worry.]
   To curse; to curse; to execrate; to condemn; also, to vex.
   [Obs.] [Spelled also warrie, warry, and wary.] "Whom I
   thus blame and warye." --Chaucer.
   [1913 Webster]

WordNet (r) 3.0 (2006):

wary
    adj 1: marked by keen caution and watchful prudence; "they were
           wary in their movements"; "a wary glance at the black
           clouds"; "taught to be wary of strangers" [ant: unwary]
    2: openly distrustful and unwilling to confide [syn: leery,
       mistrustful, suspicious, untrusting, wary]

Moby Thesaurus II by Grady Ward, 1.0:

118 Moby Thesaurus words for "wary":
   Argus-eyed, Machiavellian, Machiavellic, Pyrrhonic, Scotch, acute,
   agnostic, all ears, all eyes, arch, artful, astute, aux aguets,
   cagey, calculating, canny, careful, cautious, chary, circumspect,
   clever, considerate, crafty, cunning, custodial, cute, deceitful,
   deep, deep-laid, designing, diplomatic, discreet,
   disinclined to believe, disposed to doubt, distrustful, doubtful,
   doubting, dubious, eagle-eyed, feline, foxy, from Missouri, frugal,
   gingerly, guarded, guileful, hard of belief, hawk-eyed,
   impervious to persuasion, in doubt, inconvincible, incredulous,
   ingenious, insidious, inventive, keen-eyed, knowing, leery,
   lidless, mistrustful, mistrusting, observant, on guard,
   on the lookout, on the watch, open-eyed, pawky, politic, provident,
   prudent, questioning, ready, resourceful, safe, saving, scheming,
   scrupulous, serpentine, sharp, sharp-eyed, shifty, shrewd, shy,
   shy of belief, skeptical, sleepless, slick, slippery, sly, smooth,
   snaky, sneaky, sophistical, stealthy, strategic, subtile, subtle,
   supple, suspecting, suspicious, tactical, thrifty, trickish,
   tricksy, tricky, uncertain, unconvincible, uncredulous,
   unpersuadable, unpersuasible, untrusting, unwasteful,
   unwilling to accept, vigilant, vulpine, watchful, wily,
   with open eyes