The word "barmecidal" refers to something that is illusory or imaginary, often used in the context of food or drink that appears to be plentiful but is actually nonexistent. Antonyms for the word "most barmecidal" could include "plentiful," "substantial," "abundant," "ample," "copious," "generous," and "real." These words all suggest a plentiful and tangible quantity, rather than a mere illusion. Conversely, antonyms for "barmecidal" could include "authentic," "genuine," "realistic," "satisfying," and "tangible." These words suggest that the thing in question is not an illusion, but is instead authentic and genuinely satisfying.