bumbling vs bungled

bumbling

adj
  • Acting in a confused or ineffectual way; incompetent; showing little or no skill. 

noun
  • The act of one who bumbles; a mistake or error, especially through clumsiness. 

bungled

adj
  • Incompetently performed; ruined through incompetent action; botched up. 

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