Antonyms for the word "most out to lunch" would be phrases like "most in control," "most alert," "most focused," or "most present." People who are "out to lunch" are often perceived as being distracted or absent-minded. Finding an antonym means finding a word or phrase that represents the opposite meaning of the original word. For example, if someone is "most in control," it means they are organized, decisive, and have a clear sense of purpose. Similarly, if someone is "most alert," they are attuned to their surroundings, energized, and ready to tackle any challenge that comes their way.