impasse vs quandary

impasse

noun
  • A deadlock or stalemate situation in which no progress can be made. 

  • A road with no exit; a cul-de-sac. 

quandary

noun
  • A state of not knowing what to decide; a state of difficulty or perplexity; a state of uncertainty, hesitation or puzzlement. 

  • A dilemma, a difficult decision or choice. 

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