The word "more baritone" refers to a deeper and richer tone in vocal or musical expression. Some possible antonyms for this term include "higher-pitched," "shrill," "squeaky," "thin," "nasal," or "bird-like." These descriptors indicate a lighter, thinner, or more piercing quality of sound that would contrast with the deep and full-bodied sound of a baritone voice or instrument. The opposite of "more baritone" might also be described as "less sonorous," "less resonant," or simply "not as rich." Ultimately, the choice of antonym will depend on the context and the specific qualities of the sound being described.