careless vs solicitous

careless

adj
  • Not giving sufficient attention or thought, especially concerning the avoidance of harm or mistakes. 

  • Not concerned or worried (about). 

solicitous

adj
  • In an anxious or distressed way. 

  • In an eager way. 

  • In a conscientious way, often with kindness. 

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

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