tone down vs unsharp

tone down

verb
  • To moderate or relax; to diminish or weaken the striking characteristics of; to soften. 

  • To make a television program, piece of writing, etc. less offensive and so more suitable for a family audience. 

  • To relax; to make quieter or less obtrusive; to make milder. 

unsharp

verb
  • To sharpen (an image) by creating a blurred ("unsharp") negative as a mask, and then combining that mask with the original. 

adj
  • out of focus; blurry. 

  • dulled or intentionally blunt. 

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