The antonyms for the word "rowdinesses" would be calmness, peace, tranquility, orderliness, and civility. These opposite words describe an environment where people are composed, organized, and respectful of others. In a calm and peaceful setting, there is no agitation or disturbance. Tranquility signifies a state of calm and quiet. Similarly, orderliness suggests a sense of structure and regulation, where there is no confusion, chaos, or disorder. Finally, civility emphasizes courteous behavior and polite manners. In contrast to rowdiness, these antonyms represent the ideals of a harmonious, disciplined, and well-behaved society.