Quickfire means sudden or rapid, so antonyms would be words that suggest slowness, delay, or a more subdued pace. Examples of antonyms for quickfire include leisurely, gradual, deliberate, sluggish, tardy, languid, and unhurried. One could also use words like steady, measured, thoughtful, or cautious as antonyms for quickfire, as these suggest a more careful or controlled approach. Choosing the right antonym for a word like quickfire often depends on the context in which it is being used, as well as the tone or emphasis of the text.