Infusibility is a term used to describe a substance that cannot be dissolved or infused in liquid. There are several synonyms that can be used for infusibility, each conveying a similar meaning. Words such as insolubility, intractability, impenetrability, and non-liquefaction all refer to materials that cannot be dissolved in liquid. These terms are commonly used in chemistry and material science to describe the properties of certain substances. While infusibility may be a rare characteristic, understanding these synonyms can help in identifying and describing materials that exhibit this trait and aid in scientific research and experimentation.