The term "un-secured" implies a lack of safety or protection. Antonyms of this word would refer to security and safety measures that mitigate any risks or threats. Therefore, antonyms of "un-secured" include "secured," "safe," "protected," "guarded," "fortified," "bolstered," "fenced," and "shielded." These words suggest the presence of measures that prevent potential harm or loss. For example, a "secured" investment ensures that your money is protected against market fluctuations, while a "fortified" border means that it is not easily breached. Overall, antonyms of "un-secured" refer to measures and systems that provide safety and security to individuals, communities, and organizations.