Undersaturated is a term used in multiple fields such as chemistry, geology, and photography. It refers to a solution or a substance that has less than the maximum amount of solute dissolved in it, or an environment that has less than the maximum amount of a certain gas or element present. Synonyms for undersaturated include unsaturated, under-supersaturation, below saturation, depleted, uncharged, and low density. The term can also be used in photography to describe an image that has less color saturation than what is considered typical or desirable. Other synonyms used in this context include desaturated, faded, washed-out, and subdued. The appropriate synonym depends on the context in which undersaturated is being used.