There are several antonyms for the word "cock-a-doodle-doos," which is the sound made by a rooster. One of the antonyms could be "silence" or "quiet," which would indicate that there's no rooster crowing. Another antonym could be "night" or "dawn," as roosters typically crow at sunrise or in the early morning. Additionally, "fear" could be an antonym, as some people may be afraid of the loud and sudden sound of a rooster crowing. Similarly, "calm" may be an antonym, as the sound of a rooster crowing can disturb the peace and quiet of an environment.