inane vs not worth a whistle

inane

adj

  • Purposeless; pointless 

  • Lacking sense or meaning (often to the point of boredom or annoyance) 

  • Lacking sense or meaning (often to the point of boredom or annoyance) (lacking sense): 

noun

  • That which is void or empty. 

not worth a whistle

adj

  • Worthless or pointless. 

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