PDQ, which stands for "Pretty Darn Quick," is an idiomatic expression commonly used to describe a quick or fast action or process. Antonyms for PDQ would therefore be words that convey slowness or deliberateness in action. These antonyms may include words such as slow, leisurely, gradual, methodical, deliberate, or unhurried. For instance, instead of saying "I need to finish this report PDQ," one might say "I will complete this report gradually and systematically." The choice of antonyms for PDQ would depend on the context and tone of the sentence, but they would typically be words that convey a sense of calmness and thoughtfulness rather than urgency or haste.