Chillax, a word that is formed by the blending of two words chill and relax, means calm down and relax. Antonyms of Chillax are words that have the opposite meaning of it. The antonyms for Chillax can be stressed, anxious, worked up, restless, tense and uptight. When a person is anxious, they are worried or have a fear of something about to happen. When one is uptight, they are tense and unable to relax. So, the antonyms of Chillax are used to describe a state of mind that is opposite to calm and relaxed. Using antonyms, one can emphasize how important it is to calm down and relax when stressed or worried.