Antonyms for the word "undermining" are strengthening, reinforcing, enhancing, fortifying, and supporting. The word "undermining" implies weakening or sabotaging, usually covertly or through deceptive means. In contrast, the antonyms suggest actions that build up, bolster or secure something. Synonyms of the antonyms include buttressing, shoring up, uplifting, and uplifting. Using the antonyms could refer to positive things such as creating sustainable systems or programs, providing resources and support, empowering people, or building up strengths and capabilities. So, instead of undermining, let us all strive to support and strengthen one another for a brighter future.