Step 1: Understanding the Meaning of "Concealed":
"Concealed" means something that is hidden or kept out of sight. The closest synonym in this context is "hidden."
Step 2: Analyzing the Options:
- Covered: This is not a perfect synonym. Something covered may not necessarily be hidden; it could be visible but shielded.
- Sealed: This could mean something is closed or locked, but it does not mean hidden.
- Closed: This means something is shut, but not necessarily hidden.
- Hidden: The correct synonym for "concealed." It directly means something is out of sight or secret.
Step 3: Conclusion:
The correct synonym for "concealed" is hidden.