The word most inexcitable means that someone or something is difficult to stimulate or excite. Some of the antonyms for this word include the following: lively, animated, excited, passionate, energetic, and zealous. If someone is lively, it means that they are full of energy and enthusiasm. If they are animated, it means that they are lively and expressive. If someone is passionate, it means that they have a strong enthusiasm and interest in something. If they are energetic, it means that they have a lot of physical and mental energy. And if someone is zealous, it means that they are strongly devoted or dedicated to a cause or belief. These are all great antonyms for the word most inexcitable.