General Opposites:
* Insecure: This is the most straightforward opposite, meaning lacking confidence or safety.
* Vulnerable: This refers to being easily harmed or affected.
* Unstable: This implies a lack of firmness or reliability.
* Risky: This means exposing oneself to danger or potential loss.
Specific Opposites depending on the context:
* If talking about physical security: Unprotected, exposed, open.
* If talking about financial security: Insecure, unstable, precarious.
* If talking about emotional security: Anxious, fearful, uncertain.
* If talking about data security: Compromised, breached, hacked.
To give you the most accurate opposite, please provide more context about how you are using the word "secure."