When the sky is cloudy, it's so full of clouds that you can't see the sun. A cloudy day isn't ideal for a trip to the beach, and a cloudy night isn't great for star gazing.

A cloudy sky tells you that rain's on the way, while a cloudy pond or a cloudy glass of water isn't translucent — you can't see through it. You can also describe an issue, thought, or memory as cloudy when it's vague or half-remembered or unclear. Cloudy comes from the Old English word clud, "mass of rock," and later "cloud," based on the way a cloud can resemble a rock or hill.

Definitions of cloudy
  1. adjective
    full of or covered with clouds
    cloudy skies”
    brumous, foggy, hazy, misty
    filled or abounding with fog or mist
    enveloped in fog
    cloud-covered, clouded, overcast, sunless
    filled or abounding with clouds
    cloudlike, nebular
    resembling a cloud
    dull, leaden
    darkened with overcast
    heavy, lowering, sullen, threatening
    darkened by clouds
    miasmal, miasmic, vaporous, vapourous
    filled with vapor
    clouded with a mixture of smoke and fog
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    free from clouds or mist or haze
    cloudless, unclouded
    free from clouds
    free of clouds or rain
    completely clear and fine
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  2. adjective
    (of liquids) clouded as with sediment
    “a cloudy liquid”
    synonyms: mirky, muddy, murky, turbid
    not transmitting or reflecting light or radiant energy; impenetrable to sight
  3. adjective
    lacking definite form or limits
    “"gropes among cloudy issues toward a feeble conclusion"- H.T.Moore”
    synonyms: nebulose, nebulous
    not clearly defined or easy to perceive or understand
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