What is the antonym for rapid?

The antonym for rapid depends on the context. Here are a few options:

General antonyms:

* Slow

* Gradual

* Leisurely

* Sluggish

* Delayed

More specific antonyms:

* Steady (if referring to speed)

* Painstaking (if referring to effort)

* Methodical (if referring to process)

* Deliberate (if referring to action)

The best antonym for "rapid" will depend on the specific situation. For example, if you're talking about the speed of a car, "slow" would be the best antonym. But if you're talking about the development of a plant, "gradual" might be a better choice.