(comparative cloud·i·er, superlative cloud·i·est) adjective 1. with clouds: covered with or full of clouds 2. opaque: opaque or murky a cloudy liquid 3. resembling clouds: having the appearance of clouds 4. troubled: seeming troubled or gloomy 5. not clear: obscure or difficult to understand -cloud·i·ly, adverb -cloud·i·ness, noun