The Collaborative International Dictionary of English v.0.48:

Circumspect \Cir"cum*spect\, a. [L. circumspectus, p. p. of
   circumspicere to look about one's self, to observe; circum +
   spicere, specere, to look. See Spy.]
   Attentive to all the circumstances of a case or the probable
   consequences of an action; cautious; prudent; wary.

   Syn: See Cautious.
        [1913 Webster]

WordNet (r) 3.0 (2006):

circumspect
    adj 1: heedful of potential consequences; "circumspect actions";
           "physicians are now more circumspect about recommending
           its use"; "a discreet investor" [syn: circumspect,
           discreet]

Moby Thesaurus II by Grady Ward, 1.0:

109 Moby Thesaurus words for "circumspect":
   ambling, attentive, calculating, canny, careful, cautious, chary,
   claudicant, considerate, crawling, creeping, creeping like snail,
   curious, deliberate, discreet, discriminating, discriminative,
   easy, enlightened, faltering, flagging, foot-dragging, gentle,
   gingerly, gradual, guarded, halting, heedful, hesitant, hobbled,
   hobbling, idle, indolent, judgmatic, judicial, judicious, languid,
   languorous, lazy, leaving out nothing, leisurely, limping, loving,
   lumbering, meticulous, mindful, moderate, noncommittal, on guard,
   overlooking no possibility, pawky, poking, poky, politic,
   provident, prudent, prudential, punctilious, reflecting,
   reflective, regardful, relaxed, reluctant, safe, sauntering,
   scrupulous, shuffling, slack, slothful, slow, slow as death,
   slow as molasses, slow as slow, slow to act, slow-crawling,
   slow-foot, slow-going, slow-legged, slow-moving, slow-paced,
   slow-poky, slow-running, slow-sailing, slow-stepped, sluggish,
   snail-paced, snaillike, solicitous, staggering, strolling, tender,
   tentative, thorough, thoughtful, toddling, tortoiselike, tottering,
   trudging, turtlelike, unadventurous, uncommunicative, undaring,
   unenterprising, unhurried, unprecipitate, waddling, wary,
   well-advised, well-judged