The term "re sound" typically refers to the echo or reverberation of a sound. However, its antonyms could mean the opposite or absence of that effect. One antonym could be "mute," meaning there is no sound or the sound has been silenced. Another antonym could be "absent," referring to the lack of any sound or presence of noise. Additionally, "silent" could be used as an antonym, meaning there is no sound or noise at all. Conversely, another antonym for "re sound" could be "clarify," where there is a distinct sound with no reverberation or echo effect.