The phrase "indisposed to talk" refers to an unwillingness or reluctance to engage in conversation. Synonyms for this phrase can include "uncommunicative," "reticent," "taciturn," or "mute." These words all suggest a lack of desire or ability to speak, whether due to shyness, disinterest, or a deliberate choice to remain silent. Other similar phrases might include "reserved," "introverted," or "private." While some people may naturally be more quiet or reserved than others, it's important to note that being "indisposed to talk" could also be a sign of underlying emotional or psychological issues, such as anxiety or depression, which may require professional help to address.