at ease vs flustered

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. 

flustered

adj
  • Confused, befuddled, in a state of panic by having become overwrought with confusion. 

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