ambivalence vs unconfidence

ambivalence

noun
  • A state of uncertainty or indecisiveness. 

  • The coexistence of opposing attitudes or feelings (such as love and hate) towards a person, object or idea. 

unconfidence

noun
  • Absence of confidence; uncertainty; doubt. 

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