deeply vs only too

deeply

adv
  • To a deep extent or degree; very greatly. 

  • Richly. 

  • So as to extend far down or far into something. 

  • In a profound, not superficial, manner. 

  • At depth. 

  • In large volume. 

  • Soundly; so as to be hard to rouse. 

only too

adv
  • to a high degree; very well or very much 

  • very, all too. 

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