The antonyms for the word "more illustrating" would be "less illuminating" or "uninformative". These terms imply a lack of clarity or detail, and suggest that something is not expounded upon as fully as it could be. Other antonyms for "more illustrating" might include "obscure", "vague", or "ambiguous". These terms connote a lack of definition or precision, and may indicate that important information is not being conveyed effectively. In contrast, synonyms for "more illustrating" might include terms like "illuminating", "enlightening", or "clarifying", which suggest that the information provided is detailed, clear, and informative.