Rapid-fire is a term used to describe something that is fast and quick. Its antonyms can be words that denote a slower rate of action, such as unhurried, leisurely or slow-paced. These words describe an approach that is more comfortable and relaxed, allowing for a more manageable pace. Another antonym to rapid-fire is gradual, which signifies a process that happens in increments and progresses slowly over time. Other antonyms of rapid-fire may include measured, moderate, plodding or protracted, which all connote a deliberate and sustained use of time, with a focus on quality over quantity. Ultimately, the choice of the antonym will depend on the context in which it is used.