Reactions, as a word, connotes a series of responses or behaviors that can be exhibited in response to a particular stimulus. However, the antonyms of the word reactions or reactive are essentially terms that refer to a lack of response, or the absence of an effect in general. Proactive, insensitive, unresponsive, apathetic, unfeeling, unemotional, and uninterested are among the antonyms of reactions. While being reactive can be a crucial and adaptive trait in certain circumstances, being proactive and unresponsive can also be beneficial, depending on the situation. The antonyms of reactions provide us with alternative ways of perceiving and responding to the changes that life throws our way.