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