The word that means to talk on and on pointlessly, without
clear direction is ramble. This word is also used in cases where a person roams
or moves about in an aimless fashion. Ramble can also mean stroll or amble
about. Tina lost the attention of the
class as she started rambling about the subject and her classmates could not
make head or tail about what she was talking about. This is a good example for
the word rambling for people to understand the usage of the word.