Synonyms for Solid rock:

• n.

  •rock bottom (noun)
  • solid rock,
  • depths,
  • record low,
  • rock-bottom,
  • base,
  • solid bottom,
  • all-time low,
  • nadir.

• Other synonyms:

  •Other relevant words (noun):
  • bedrock,
  • flooring,
  • understructure,
  • bedding,
  • floor,
  • grounds,
  • sill,
  • groundwork,
  • seat,
  • bed,
  • rudiment,
  • Underpinning,
  • principle,
  • substructure,
  • substratum,
  • foundation,
  • footing,
  • terra firma,
  • fundament,
  • rock bottom,
  • pavement.