afraid vs shit scared

afraid

adj
  • Impressed with fear or apprehension; in fear. 

  • Regretful, sorry; expressing a reluctance to face an unpleasant situation. 

  • Worried about, feeling concern for, fearing for (someone or something). 

shit scared

adj
  • Very frightened; terrified. 

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