at ease vs foreboding

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. 

foreboding

adj
  • Of ominous significance; serving as an ill omen; foretelling of harm or difficulty. 

noun
  • A sense of evil to come. 

  • An evil omen. 

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