The antonyms for the phrase "not prepared for" can vary depending on the context, but generally, they include "ready," "equipped," "planned for," "organized," "forewarned," and "anticipated." These words describe a state of readiness or readiness to face a given situation, whether it is a sudden emergency or a well-planned event. In contrast, being "not prepared" implies a lack of foresight or ability to anticipate and respond to the events that have occurred, which can lead to negative consequences. To be prepared means to have a plan in place, to anticipate what might happen, and to be ready with the resources and skills necessary to face the situation head-on.