The word "inexcitabilities" refers to the state or quality of being unexcitable or unresponsive. Antonyms for this word would include terms that describe excitement or responsiveness, such as enthusiasm, liveliness, animation, or eagerness. These words suggest a state of heightened energy, passion, or engagement, and are the opposite of indifference, lethargy, or stoicism. Other antonyms might include terms like spontaneity, impulsivity, or impulsiveness, which imply a willingness to act or respond quickly and without hesitation. Ultimately, the antonyms for "inexcitabilities" suggest a vibrant and dynamic state of being, which is the opposite of a passive or unresponsive one.