ineffectual vs not worth a whistle

ineffectual

adj

  • Worthless; ineffective. 

  • Unable or insufficient to produce effect. 

  • Weak, indecisive; lacking forcefulness. 

not worth a whistle

adj

  • Worthless or pointless. 

How often have the words ineffectual and not worth a whistle occurred in a corpus of books? (source: Google Ngram Viewer )