responsive vs voiceless

responsive

adj
  • using antiphons; antiphonal 

  • answering, replying or responding 

  • susceptible to the feelings of others 

  • automatically resizing and repositioning elements to fit the available space 

  • able to receive and respond to external stimuli 

voiceless

adj
  • Spoken without vibration of the vocal cords; unvoiced, surd, breathed. Examples: [t], [s], [f], [m̥], [u̥]. 

  • Without a vote; having no input into a decision. 

  • Lacking a voice, without vocal sound. 

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