The Collaborative International Dictionary of English v.0.48:

Cloudy \Cloud"y\ (kloud"[u^]), a. [Compar. Cloudier; superl.
   Cloudiest.] [From Cloud, n.]
   1. Overcast or obscured with clouds; clouded; as, a cloudy
      sky.
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   2. Consisting of a cloud or clouds.
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            As Moses entered into the tabernacle, the cloudy
            pillar descended.                     --Ex. xxxiii.
                                                  9
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   3. Indicating gloom, anxiety, sullenness, or ill-nature; not
      open or cheerful. "A cloudy countenance." --Shak.
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   4. Confused; indistinct; obscure; dark.
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            Cloudy and confused notions of things. --Watts.
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   5. Lacking clearness, brightness, or luster. "A cloudy
      diamond." --Boyle.
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   6. Marked with veins or sports of dark or various hues, as
      marble.
      [1913 Webster]

WordNet (r) 3.0 (2006):

cloudy
    adj 1: lacking definite form or limits; "gropes among cloudy
           issues toward a feeble conclusion"- H.T.Moore; "nebulous
           distinction between pride and conceit" [syn: cloudy,
           nebulose, nebulous]
    2: full of or covered with clouds; "cloudy skies" [ant: clear]
    3: (of liquids) clouded as with sediment; "a cloudy liquid";
       "muddy coffee"; "murky waters" [syn: cloudy, muddy,
       mirky, murky, turbid]

Moby Thesaurus II by Grady Ward, 1.0:

95 Moby Thesaurus words for "cloudy":
   Acheronian, Acherontic, Cimmerian, Stygian, addlebrained, addled,
   addleheaded, addlepated, adiaphanous, amorphous, angry, beclouded,
   befuddled, blind, castellatus, cirrose, cirrous, clear as mud,
   cloud-flecked, clouded, cumuliform, cumulous, cyclonic, dark,
   dark and gloomy, dim, dirty, dull, fogged, foggy, foul,
   fuddlebrained, fuddled, funereal, fuzzy, gloomful, glooming,
   gloomy, grumly, hazy, heavy, ill-lighted, ill-lit,
   impervious to light, in a fog, in a muddle, indeterminate,
   indistinct, intransparent, lenticularis, lowering, mammatus,
   misted, misty, mucky, muddled, muddleheaded, muddy, murky, mushy,
   muzzy, nebulous, nimbose, nubilous, obscure, opaque, overcast,
   overclouded, puzzleheaded, raging, rainy, roiled, roily, shadowy,
   shapeless, somber, sombrous, squally, storming, stormy, stratiform,
   stratous, tempestuous, thunderheaded, tornadic, transcendent,
   turbid, turbulent, typhonic, typhoonish, unclear, unplain, vague,
   vaporous, vapory