Incompressible

In′com‐press″i‐ble (?), a. [Pref. in- not + compressible: cf. F. incompressible.] Not compressible; incapable of being reduced by force or pressure into a smaller compass or volume; resisting compression; as, many liquids and solids appear to be almost incompressible. — In′com‐press″i‐ble‐ness, n.