Antonyms for the word "being quiescent" would be actions or states that are characterized by movement, agitation or activity. Some of the antonyms could be words like restless, active, agitated, dynamic, lively or exuberant. Being restless would suggest a state of unease, a need to move or alter one's situation, whereas being active would imply movement towards productive goals. Similarly, the word agitated suggests a state of being in turmoil, restless or perturbed. Dynamic implies that something is in motion or changing and lively suggests the presence of energy or excitement. Finally, exuberant points to a state of joy or happiness that is expressed through movement and activity. These antonyms demonstrate the varied range of states possible for a person or an entity that is contrasted with being quiescent.