abiding vs steadfast

abiding

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

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

steadfast

adj
  • Fixed or unchanging; steady. 

  • Firmly loyal or constant; unswerving. 

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