clearly vs imperceptibly

clearly

adv
  • To a degree clearly discernible. 

  • In a clear manner. 

  • Without a doubt; obviously. 

imperceptibly

adv
  • Beyond the purview of man; too great and all-encompassing to be perceived. 

  • Not noticeably; too small to be detected; too little to be perceived. 

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