heedless vs solicitous

heedless

adj
  • Unaware; without noticing; careless; inattentive. 

solicitous

adj
  • Disposed to solicit; eager to obtain something desirable, or to avoid anything evil. 

  • In an anxious or distressed way. 

  • In an eager way. 

  • In a conscientious way, often with kindness. 

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