castoff vs inane

castoff

noun

  • Something that has been rejected or discarded; a reject. 

adj

  • discarded, rejected. 

inane

noun

  • That which is void or empty. 

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): 

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