Most nonplused refers to a state of confusion, uncertainty or bewilderment. Antonyms for this term would include words that indicate a clear, certain or confident state of mind. Some antonyms for most nonplused include assured, confident, composed, cool, collected, decisive, resolute, self-assured, and surefooted. These words imply a sense of control and poise, suggesting that the individual is able to make informed decisions and take action with conviction. In contrast to nonplused, these words indicate a sense of clarity and focus, indicating that the individual is able to navigate difficult situations with ease and effectiveness.