ball of fire vs indolent

ball of fire

noun
  • A person who is especially hard-working, high-achieving, ambitious, or active. 

indolent

adj
  • Healing slowly 

  • Inducing laziness 

  • Causing little or no physical pain; progressing slowly; inactive (of an ulcer, etc.) 

  • Habitually lazy, procrastinating, or resistant to physical labor 

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