The Collaborative International Dictionary of English v.0.48:

ducky \ducky\ (d[u^]k"[y^]), a.
   1. fine; satisfactory; excellent. [informal]
      [PJC]

   2. charming; cute. [informal]
      [PJC]

The Collaborative International Dictionary of English v.0.48:

ducky \ducky\ (d[u^]k"[y^]), n.
   a special loved one; a darling; -- used as a term of
   endearment. [Brit.]

   Syn: darling, favorite, favourite, pet, dearie, deary.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

ducky
    n 1: a special loved one [syn: darling, favorite,
         favourite, pet, dearie, deary, ducky]

Moby Thesaurus II by Grady Ward, 1.0:

46 Moby Thesaurus words for "ducky":
   OK, ace-high, bad, bang-up, bonzer, boss, bully, but good, cool,
   corking, crackerjack, dandy, delicious, fab, fine and dandy, gear,
   great, groovy, heavy, hot, hunky-dory, jam-up, just dandy, keen,
   marvy, mean, neat, nifty, nobby, okay, out of sight, peachy,
   peachy-keen, ripping, rum, scrumptious, slap-up, smashing, solid,
   something else, spiffing, spiffy, stunning, swell, tough, wizard