Which word signifies a lack of openness or frankness?

The word "reticent" specifically describes someone who is reserved or reluctant to speak freely, indicating a lack of openness or frankness in communication. When a person is reticent, they may hold back their thoughts or feelings, choosing not to express themselves openly, which aligns perfectly with the idea of a lack of transparency or willingness to share information. This term is often used to describe people who are tight-lipped or hesitant to engage in conversation, underscoring the notion of reticence as a barrier to candid expression.

In contrast, the other terms do not convey this same meaning of withholding communication. "Reproachable" refers to something deserving criticism or blame, "reverent" pertains to deep respect or admiration, and "rhetorical" relates to the effective use of language or questions not meant to be answered literally. These terms highlight different concepts that do not align with the idea of a lack of openness.