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The word "brash" typically describes someone who is overly bold, aggressive, or self-assertive, often in a way that is considered rude or lacking in tact. Therefore, a word that conveys a sense of gentleness, consideration, or respectfulness would be nearly opposite to "brash."

"Polite" fits this concept as it describes someone who is courteous, respectful, and considerate of others, traits that stand in contrast to the boldness associated with being brash. This opposition is rooted in the mannerisms and attitudes that define these characteristics—while brashness implies a lack of inhibition and disregard for social norms, politeness embodies a careful adherence to them.

Other choices may suggest alternative meanings but do not encapsulate the opposite of "brash." For example, "arrogant" also indicates an inflated sense of self-importance, while "dull" and "shiny" relate to physical descriptions and do not convey social behavior or demeanor. Thus, "polite" emerges as the most fitting opposite in this context.