Which of the following words means to be overly talkative?

The word "garrulous" specifically describes someone who is excessively talkative, particularly about trivial matters. This term conveys a sense of loquaciousness that goes beyond mere conversation, implying that the person speaks at length, often without a meaningful point.

In contrast, the other options do not convey the same meaning. "Gibe" refers to mocking or making sarcastic remarks, "hallow" means to make holy or set apart as sacred, and "facile" generally describes something that is easily accomplished or achieved but can also imply a lack of depth or sincerity. Thus, "garrulous" is the most accurate choice in this context, as it directly relates to being overly talkative.