The word "burgeoning" refers to something that is growing rapidly and flourishing. Therefore, it's antonyms would describe something that is static, stagnant or declining. Some possible antonyms for "more burgeoning" could be "diminishing," "fading," "shrinking," "weakening," "contracting," "waning," "slowing down," or "stagnant." These antonyms would suggest a decline, a lack of growth or a loss of vitality. It's essential to know the antonyms of a word to understand its meaning better and to use it effectively in communication, writing or speaking.