The antonyms for the phrase acted cool are displayed a lot of emotions, acted nervous, acted insecure or acted awkwardly. These antonyms show the variety of emotions that a person can display in a given situation. If someone is acting cool, they are displaying a calm and composed attitude. Conversely, if someone is displaying a lot of emotions, they are unable to control their emotional state. Acting nervous typically demonstrates a lack of confidence or fearfulness. Acting insecure showcases a lack of faith in oneself, and acting awkwardly denotes unfamiliarity or discomfort. Hence, the opposing words to 'acted cool' are a diverse group of emotions that an individual can display in varying circumstances.