However, you might be interested in words related to "instantaneous" that do have prefixes or suffixes:
* Prefixes:
* In-: Instant (meaning the moment itself)
* Im-: Immediate (happening without delay)
* Un-: Uninstantaneous (not happening instantly)
* Suffixes:
* -ly: Instantaneously (adverb form)
It's important to note that some of these words have different meanings, and their usage depends on the context.