"Pretenseless" implies a lack of deception or insincerity. Its antonyms can be illustrated through words such as "artificial," "deceptive," "disingenuous," or "misleading." These words suggest an intention to hide the truth or objectives. For instance, an artificial smile does not represent authentic emotions, while a disingenuous apology contains hidden agendas. The opposite of pretenseless can also include words that describe superficiality or extravagance, such as "ostentatious," "showy," or "flamboyant." These words indicate a desire for attention or material possessions that mask one's true character. In contrast, pretenseless people or actions align with honesty, sincerity, and openness.