at ease vs equable

at ease

prep
  • Allowed to refrain from being in rigid formation. 

  • Free of anxiety; not stressed or tense. 

  • In a relaxed position with the feet apart rather than at attention. 

equable

adj
  • Not easily disturbed; tranquil. 

  • Unvarying, calm and steady; constant and uniform. 

  • Free from extremes of heat or cold. 

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