attentive vs intentive

attentive

adj
  • Paying attention; noticing, watching, listening, or attending closely. 

  • Courteous; mindful. 

intentive

adj
  • Paying attention; attentive, heedful. 

  • Expressing intent. 

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

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