Antonyms for the phrase "caught off guard" can include being prepared, being aware, being alert, being on guard, being vigilant, and being attentive. These words suggest a state of readiness or vigilance, indicating that the person is aware of potential challenges and is equipped to handle them. Being prepared allows individuals to anticipate and react appropriately to unexpected situations, ensuring that they are not caught off guard. On the other hand, being caught off guard suggests a state of unpreparedness or lack of awareness, resulting in a potentially negative outcome. Therefore, it is essential to remain vigilant and prepared to handle any surprises that may arise.