The antonym for "more alight" is "less alight". The word alight means to land or settle, and when used with "more", it denotes a deeper landing or settling. Conversely, when used with "less", it indicates a shallower landing or settling. The word alight can also imply being on fire or illuminated, in which case the antonyms would be "extinguished" or "dimmed" respectively. In a broader sense, the antonyms for "more alight" could include "heavier" or "less maneuverable" depending on the context in which the phrase is used. Ultimately, the choice of antonym will depend on the exact meaning of "more alight" in the sentence.