Antonyms for the word "more undiminished" include "less diminished," "fading," "reducing," "shrinking," "weaker," "lessening," and "declining." These words describe the opposite of "more undiminished," conveying a sense of reduced or diminishing intensity, strength, or quantity. While "more undiminished" suggests a continued and sustained growth or development, its antonyms indicate a decrease or waning of these qualities. It is essential to consider the antonyms of a word to gain a better understanding of its meaning and to use the appropriate word in context.