The antonyms for the phrase "blunders on" are graceful, calculated, deliberate, and precise. These words describe actions that are done with intention and without any clumsiness or mistakes. Being graceful implies the person is smooth, poised, and elegant, while calculated means they are planning and executing their actions with care. Deliberate actions are purposeful and intentional, while precise denotes accuracy and attention to detail. These antonyms are useful when describing someone who is skilled and accomplished in their actions, as opposed to someone who is making mistakes and blunders along the way.