centered vs sidelong

centered

adj
  • middlemost; located at the center 

  • emotionally stable, calm, serene; having a balanced mind 

sidelong

adv
  • obliquely 

  • Towards the side; sideways. 

adj
  • Slanting or sloping; oblique. 

  • Indirect; suggestive; not straightforward. 

  • Directed to the side; sideways. 

  • Along the side of something. 

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