abortifacient vs inefficacious

abortifacient

adj

  • Producing miscarriage. 

noun

  • A drug or an agent that induces an abortion. 

inefficacious

adj

  • Not effective. 

  • Incapable of having the intended consequence. 

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