The term "dis-improve" means to make something worse or decrease its quality or value. When seeking antonyms for this word, the opposite would be to improve, enhance or upgrade something. Improving signifies to make something better, more effective, or of more elevated quality. At times, synonyms for improving could be revamp, ameliorate, refine, or better. Enhance implies elevating something that is already good but not perfect. Synonyms for enhance comprises of augment, boost, lift, or heighten. Upgrade means to bring something to a greater level of performance or status. Alternatives to upgrade could be enhance or modernize.