The Collaborative International Dictionary of English v.0.48:

Easy \Eas"y\, a. [Compar. Easier; superl. Easiest.] [OF.
   aisi['e], F. ais['e], prop. p. p. of OF. aisier. See Ease,
   v. t.]
   1. At ease; free from pain, trouble, or constraint; as:
      (a) Free from pain, distress, toil, exertion, and the
          like; quiet; as, the patient is easy.
      (b) Free from care, responsibility, discontent, and the
          like; not anxious; tranquil; as, an easy mind.
      (c) Free from constraint, harshness, or formality;
          unconstrained; smooth; as, easy manners; an easy
          style. "The easy vigor of a line." --Pope.
          [1913 Webster]

   2. Not causing, or attended with, pain or disquiet, or much
      exertion; affording ease or rest; as, an easy carriage; a
      ship having an easy motion; easy movements, as in dancing.
      "Easy ways to die." --Shak.
      [1913 Webster]

   3. Not difficult; requiring little labor or effort; slight;
      inconsiderable; as, an easy task; an easy victory.
      [1913 Webster]

            It were an easy leap.                 --Shak.
      [1913 Webster]

   4. Causing ease; giving freedom from care or labor;
      furnishing comfort; commodious; as, easy circumstances; an
      easy chair or cushion.
      [1913 Webster]

   5. Not making resistance or showing unwillingness; tractable;
      yielding; complying; ready.
      [1913 Webster]

            He gained their easy hearts.          --Dryden.
      [1913 Webster]

            He is too tyrannical to be an easy monarch. --Sir W.
                                                  Scott.
      [1913 Webster]

   6. Moderate; sparing; frugal. [Obs.] --Chaucer.
      [1913 Webster]

   7. (Com.) Not straitened as to money matters; as, the market
      is easy; -- opposed to tight.
      [1913 Webster]

   Honors are easy (Card Playing), said when each side has an
      equal number of honors, in which case they are not counted
      as points.

   Syn: Quiet; comfortable; manageable; tranquil; calm; facile;
        unconcerned.
        [1913 Webster]

WordNet (r) 3.0 (2006):

easy
    adv 1: with ease (`easy' is sometimes used informally for
           `easily'); "she was easily excited"; "was easily
           confused"; "he won easily"; "this china breaks very
           easily"; "success came too easy" [syn: easily, easy]
    2: without speed (`slow' is sometimes used informally for
       `slowly'); "he spoke slowly"; "go easy here--the road is
       slippery"; "glaciers move tardily"; "please go slow so I can
       see the sights" [syn: slowly, slow, easy, tardily]
       [ant: apace, chop-chop, quickly, rapidly, speedily]
    3: in a relaxed manner; or without hardship; "just wanted to
       take it easy" (`soft' is nonstandard) [syn: easy, soft]
    adj 1: posing no difficulty; requiring little effort; "an easy
           job"; "an easy problem"; "an easy victory"; "the house is
           easy to heat"; "satisfied with easy answers"; "took the
           easy way out of his dilemma" [ant: difficult, hard]
    2: not hurried or forced; "an easy walk around the block"; "at a
       leisurely (or easygoing) pace" [syn: easy, easygoing,
       leisurely]
    3: free from worry or anxiety; "knowing that I had done my best,
       my mind was easy"; "an easy good-natured manner"; "by the
       time the chsild faced the actual problem of reading she was
       familiar and at ease with all the elements words" [ant:
       uneasy]
    4: affording pleasure; "easy good looks"
    5: having little impact; "an easy pat on the shoulder"; "gentle
       rain"; "a gentle breeze"; "a soft (or light) tapping at the
       window" [syn: easy, gentle, soft]
    6: readily exploited or tricked; "an easy victim"; "an easy
       mark"
    7: in fortunate circumstances financially; moderately rich;
       "they were comfortable or even wealthy by some standards";
       "easy living"; "a prosperous family"; "his family is well-
       situated financially"; "well-to-do members of the community"
       [syn: comfortable, easy, prosperous, well-fixed,
       well-heeled, well-off, well-situated, well-to-do]
    8: marked by moderate steepness; "an easy climb"; "a gentle
       slope" [syn: easy, gentle]
    9: affording comfort; "soft light that was easy on the eyes"
    10: casual and unrestrained in sexual behavior; "her easy
        virtue"; "he was told to avoid loose (or light) women";
        "wanton behavior" [syn: easy, light, loose,
        promiscuous, sluttish, wanton]
    11: less in demand and therefore readily obtainable;
        "commodities are easy this quarter"
    12: obtained with little effort or sacrifice, often obtained
        illegally; "easy money"