Which of the following best describes someone who is "reticent"?

The term "reticent" refers to someone who is reserved or restrained in their speech and actions. A reticent person typically does not share their thoughts or feelings readily, often appearing shy or reluctant to speak. This quality is characterized by a certain level of discretion and an inclination to keep personal matters private.

In the context of the other choices, being "talkative" implies a propensity to engage in conversation frequently, which directly contrasts with reticence. "Outgoing" describes someone who is sociable and enjoys being around others, also differing significantly from a reticent demeanor. "Overly enthusiastic" suggests an exuberant and expressive nature, which is again at odds with a calm, reserved disposition typical of someone who is reticent. Thus, the best description for a reticent person aligns with the quality of being shy, as they may choose to remain silent or avoid drawing attention to themselves.