blabby vs gibbering

blabby

adj
  • Tending to blab or gossip a lot. 

gibbering

adj
  • Prone to meaningless vocalization, especially excited and confused utterances, like a beast or monster. 

noun
  • Manic, meaningless speech; babble. 

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