boisterous vs unthreatening

boisterous

adj
  • Having or resembling animal exuberance. 

  • Full of energy; exuberant; noisy. 

  • Characterized by violence and agitation; wild; stormy. 

unthreatening

adj
  • Not threatening 

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