The quote "A yawning repetitiveness as of a man who knows few words but will not stop talking," from John Updike's book "Brazil," captures a sense of frustration with monotony in communication. It suggests that the speaker is caught in a cycle of words that lack depth, reflecting a struggle to express oneself meaningfully. This repetition can evoke a feeling of tedium and insignificance, as the words carry little weight or variety.

Updike’s choice of imagery emphasizes the disconnect between the desire to communicate and the limitations of vocabulary. In a broader context, it may critique how some individuals engage in endless talk without contributing anything substantial to a conversation. This highlights the importance of thoughtful dialogue over mere wordiness, encouraging more profound engagement rather than superficial chatter.