abiding vs solid as a rock

abiding

adj
  • Continuing or persisting in the same state: lasting, enduring; steadfast. 

noun
  • The action of one who abides; the state of an abider. 

solid as a rock

adj
  • Extremely thick and heavy, so as to make it impossible to move. 

  • Very reliable and dependable 

How often have the words abiding and solid as a rock occurred in a corpus of books? (source: Google Ngram Viewer )