subsaturated

/sʌbˈsætʃəˌreɪtɪd/
adjective
  1. Containing less of a substance than can be dissolved or absorbed at a given temperature and pressure; not fully saturated.
    • In subsaturated air, water droplets evaporate quickly.
    • The subsaturated solution could still dissolve more salt.
    • The chemist noted that the liquid was subsaturated with carbon dioxide.