fidget vs shudder

fidget

verb
  • To cause to fidget; to make uneasy. 

  • To wiggle or twitch; to move the body, especially the fingers, around nervously or idly. 

noun
  • A person who fidgets, especially habitually. 

  • A nervous wriggling or twitching motion. 

  • A toy intended to be fidgeted with. 

shudder

verb
  • To shake nervously, often from fear or horror. 

  • To vibrate jerkily. 

noun
  • A moment of almost pleasurable fear; a frisson. 

  • A shivering tremor, often from fear or horror. 

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