The word "lepidopterous" refers to creatures in the order Lepidoptera, which includes butterflies and moths. When describing something as "most lepidopterous," you are emphasizing its resemblance to these beautiful insects. Synonyms for this phrase might include "butterfly-like," "moth-like," "lepidopteran," or "lepidopteriform." Other words related to Lepidoptera that could fit into this context include "flittery," "delicate," "winged," and "fluttering." By making use of synonyms in your writing, you can help to make your text more varied and interesting to read while also adding precision and depth to your descriptions.