hairline vs ineffectual

hairline

adj
  • very thin, as thin as a hair 

noun
  • A fishing line made from hair. 

  • The line along one's forehead where hair starts growing. 

  • A very thin line in writing, drawing, or typography. 

  • A very thin fissure. 

ineffectual

adj
  • Weak, indecisive; lacking forcefulness. 

  • Unable or insufficient to produce effect. 

  • Worthless; ineffective. 

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