The term 'rambled on and on' can be described by the crossword solutions of 'PRATED' (6 letters), 'nattered' (8 letters) and 'YAKKED' (6 letters). PRATED is an archaic verb meaning to talk in a long-winded or boastful manner. Nattered is a British slang term meaning to talk incessantly and aimlessly. YAKKED is an informal verb meaning to talk rapidly and at length. All three words describe someone talking for a long period of time without saying anything meaningful.