careless vs intentive

careless

adj
  • Not concerned or worried (about). 

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

intentive

adj
  • Paying attention; attentive, heedful. 

  • Expressing intent. 

  • Intent (of the mind, thoughts etc.). 

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