anxious vs biting one’s nails

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. 

biting one’s nails

How often have the words anxious and biting one’s nails occurred in a corpus of books? (source: Google Ngram Viewer )