What is suffix of weightlessness?

There isn't a standard suffix for "weightlessness." The word itself is already a noun and describes the state of being without weight.

If you're looking for related terms, you could consider:

* -less: This suffix indicates the absence of something, as in "weightless."

* -ity: This suffix can be used to form nouns describing a state or quality, like "gravity." You could potentially use it to create a word like "weightlessnessity," though this is not a standard word and might sound awkward.

Ultimately, the best way to express the concept of "weightlessness" depends on the specific context and what you want to emphasize.