How do you spell thrusday in a short way?

There isn't a universally accepted short spelling for "Thursday". However, here are some options depending on the context:

Informal:

* Thurs: This is the most common abbreviation, especially in casual settings.

* Thu: This is slightly more formal than "Thurs".

Formal:

* Th: This abbreviation is used in some cases, but it's not as common as the others.

It's important to note that abbreviations can be context-dependent. If you're unsure, it's always best to spell out the full word.