General:
* As sharp as a tack: This simile emphasizes quick wit and mental agility.
* As bright as a lightbulb: This simile implies a clear understanding and quick comprehension.
* As clever as a fox: This simile suggests cunning and resourcefulness.
* As wise as an owl: This simile portrays a deep understanding and insightful judgment.
Specific:
* As analytical as a detective: This simile emphasizes logical thinking and problem-solving skills.
* As creative as a painter: This simile highlights imagination and innovative ideas.
* As eloquent as a poet: This simile points to strong communication skills and a mastery of language.
* As strategic as a chess player: This simile emphasizes planning, foresight, and strategic thinking.
The best simile for you will depend on the specific context and the particular aspect of intelligence you want to highlight.