The word "eloquent'' means fluent or persuasive in speaking or writing. It describes someone who can express ideas clearly and effectively.
Step 1: Understand the options:
- "Expensive'': Related to cost, not communication.
- "Mysterious'': Implies secrecy or being hard to understand — not related to speaking well.
- "Anxious'': Refers to being worried or uneasy — unrelated.
- "Articulate'': Means able to speak clearly and effectively — matches the meaning of "eloquent''.
Thus, "articulate'' is the correct synonym for "eloquent''.