incompressible
1. [ adjective ] impossible to compress; resisting compression
Examples:

"mounds of incompressible garbage"

Related terms: compressible
Similar spelling:   incomprehensible
  incompressibility
  incompatible
  incomprehensive
  incommensurable
  incomputable
  incomparable
  incompleteness
  incomprehension
  incompatibility
  incompatibly
  incombustible
  incontestible
  in_some_respects
  in_commission