tergiversation vs vagueness

tergiversation

noun
  • The act of evading any clear course of action or speech, of being deliberately ambiguous; equivocation; fickleness. 

  • The act of abandoning something or someone, of changing sides; desertion; betrayal. 

vagueness

noun
  • Something which is vague, or an instance or example of vagueness. 

  • The condition of being unclear; vague. 

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