incisiveness vs insight

incisiveness

noun
  • The quality or state of being incisive; incisivity. 

insight

noun
  • Intuitive apprehension of the inner nature of a thing or things; intuition. 

  • Knowledge (usually derived from consumer understanding) that a company applies in order to make a product or brand perform better and be more appealing to customers 

  • A sight or view of the interior of anything; a deep inspection or view; introspection; frequently used with into. 

  • An extended understanding of a subject resulting from identification of relationships and behaviors within a model, context, or scenario. 

  • Power of acute observation and deduction 

  • An individual's awareness of the nature and severity of one's mental illness. 

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