What is the comparative forms of word rarely?

The comparative form of "rarely" is less rarely.

However, it's important to note that "rarely" is an adverb, and using "less" in this context isn't the most common or natural way to express a comparison.

Here are some alternative ways to express the idea of something happening less often:

* More often

* Frequently

* Regularly

* Often

* Sometimes

For example, instead of saying "He visits less rarely now," you could say "He visits more often now" or "He visits frequently now."