attentive vs musing

attentive

adj

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

  • Courteous; mindful. 

musing

adj

  • Absorbed in thought; contemplative 

noun

  • thought, meditation, contemplation 

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