off the hook vs unattached

off the hook

adj
  • Of a telephone, having an open connection; not hung up. 

  • Performing extraordinarily well. 

  • Relieved of a duty, burden, responsibility, or pressure. 

  • Fresh, cool, trendy, excellent, incredible. 

  • Of a telephone, ringing frequently. 

unattached

adj
  • Not attached or joined; disconnected. 

  • Not connected with or belonging to a particular group or organization. 

  • Not married and not involved in a romantic relationship. 

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