The antonyms for the word "most cockamamie" would be words that are associated with being rational, logical, and sensible. Words such as sound, reasonable, valid, analytical, and practical can be used as antonyms for cockamamie. Being sensible means being able to make sound judgments and rational decisions based on evidence and logic, which is the opposite of being cockamamie. Therefore, using antonyms of cockamamie can be helpful in situations that require precision, accuracy, and critical thinking. Using words such as practical or analytical can help you convey your thoughts in a more clear and concise manner.