General:
* Explanatory: This is the most direct and common adjective.
* Illustrative: This implies the explanation is clear and helpful in demonstrating something.
* Informative: This highlights the goal of providing information.
Positive:
* Comprehensive: This suggests a thorough and complete explanation.
* Insightful: This implies the explanation provides a deeper understanding.
* Lucid: This describes an explanation that is clear and easy to understand.
* Persuasive: This suggests the explanation is convincing.
Negative:
* Vague: This indicates an unclear or ambiguous explanation.
* Superficial: This suggests the explanation lacks depth or detail.
* Confusing: This describes an explanation that is difficult to understand.
* Unsatisfactory: This implies the explanation is not adequate or helpful.
Other:
* Detailed: This implies the explanation is thorough and provides many specifics.
* Technical: This describes an explanation using specialized language.
* Concise: This suggests a brief and to-the-point explanation.
Ultimately, the best adjective to use will depend on the specific context and the desired nuance.