anxious vs white-knuckled

anxious

adj
  • Having a feeling of anxiety or disquietude; extremely concerned, especially about something that will happen in the future or that is unknown. 

  • Earnestly desirous. 

  • Nervous and worried. 

  • Accompanied with, or causing, anxiety; worrying. 

white-knuckled

How often have the words anxious and white-knuckled occurred in a corpus of books? (source: Google Ngram Viewer )