Closemouthed is the word used to describe someone who is secretive, reserved or reluctant to speak. However, there are several other synonyms for this word, including tight-lipped, reticent, uncommunicative, reserved, silent, and speechless. Each of these words carries a similar meaning to closemouthed and are all used to describe someone who is not willing to share their thoughts and feelings with others. It is important to note that while these words are similar, they each have a slightly different connotation, thus it is essential to use the one that fits best for a specific situation.