The word "most cockamamy" is a colloquial expression meaning absurd, ridiculous, or nonsensical. Antonyms for this phrase include logical, sensible, and reasonable. If something is described as "most cockamamy," it is not just a little bit silly, but rather completely nonsensical. The antonyms for this phrase are words that describe things that make sense, are well thought out, and don't require a lot of mental gymnastics to understand. In today's world where misinformation and conspiracy theories abound, it's important to be able to recognize what is most cockamamy and focus on what is logical and sensible.