negligibly vs substantially

negligibly

adv
  • To a degree that is negligible; so small or slight that it may be ignored. 

substantially

adv
  • Without material qualifications. 

  • In a strong substantial manner; considerably. 

  • To a great extent; in essence; essentially. 

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