feminine vs weaker sex

feminine

noun
  • The feminine gender. 

  • That which is feminine. 

  • A word of the feminine gender. 

adj
  • Being inflected in agreement with a feminine noun. 

  • Belonging to females; typically used by females. 

  • Of or pertaining to the female sex; biologically female, not male. 

  • Having the qualities stereotypically associated with women: nurturing, not aggressive. 

  • Being of the feminine class or grammatical gender, and inflected in that manner. 

  • Having the vowel harmony of a front vowel. 

  • Of or pertaining to the female gender; womanly. 

weaker sex

noun
  • Women; the female gender. 

  • Used other than figuratively or idiomatically: see weaker, sex. 

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