softly vs weakly

softly

adv
  • In a soft manner; gently. 

  • Not loudly; nearly inaudibly. 

weakly

adv
  • With little strength or force. 

adj
  • Frail, sickly or of a delicate constitution; weak. 

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