The word "cock-a-doodle-dooing" is a unique and unusual term that refers to the crowing sound made by roosters. However, when it comes to antonyms for this term, we can think of words that represent the opposite of the sound of a rooster. For instance, silence, stillness, and peace can be considered antonyms of the loud and raucous sound of a rooster. Other antonyms may include calm, quietness, and serenity. These antonyms provide a sense of tranquility and calmness that directly oppose the frenzied crowing of a rooster. Ultimately, the antonyms for "cock-a-doodle-dooing" represent the opposite energy and mood that the sound of a rooster produces.