The word "more developing" refers to a state of progress or growth. However, if one were to look for antonyms of this word, they would seek out language that describes a state of stagnation or regression. These words might include "lessening," "shrinking," "declining," "receding," or "contracting." Each of these words implies a reduction in growth or forward momentum. While "more developing" might be used to describe a rapidly growing economy, infrastructure, or population, its antonyms suggest a decline in those areas. As such, it is important to choose one's language carefully when discussing these topics in order to convey the desired message.