Brazen-mouthed is a term used to describe people who are overly bold, impudent, or shameless in their speech. It is an expression that refers to people who have no qualms about expressing their opinions, even if they are unflattering to others. There are several synonyms that capture the essence of brazen-mouthed, including audacious, impertinent, insolent, forward, presumptuous, and shameless. These terms describe individuals who are not afraid to speak their minds and who exude confidence in their interactions with others. So, whether you are trying to describe someone's behavior in a social setting or commenting on their personality, these synonyms for brazen-mouthed will come in handy.