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1. Not saturated; capable of dissolving more of a substance at a given temperature
   "an unsaturated salt solution"
    
2. Used of a compound (especially of carbon) containing atoms sharing more than one valence bond
   "unsaturated fats"
    
3. (of colour) not chromatically pure; diluted
   "an unsaturated red"

See also: dull, monounsaturated, polyunsaturated

Antonym: saturated

Encyclopedia: Unsaturated