For clarity of expression:
* Clearly: This is the most straightforward option.
* Explicitly: Emphasizes a direct and unambiguous manner.
* Precisely: Focuses on accuracy and detail.
* Articulately: Highlights fluent and effective communication.
For clarity of thought or understanding:
* Plainly: Conveys simplicity and directness.
* Understandably: Emphasizes easy comprehension.
* Evidently: Suggests clear proof or reason.
For clarity of vision or perception:
* Distinctly: Highlights sharp and clear vision.
* Sharply: Focuses on a sharp and defined image.
The best choice will depend on the specific meaning you want to convey.