I hope you'll accept this token of remorse.
We use Ctrl-F4 to close a document, and of course if the contents of the document have changed we get to answer the skill-testing question "Do you want to save?".
Oftentimes we know in advance that we don't want the changes. Perhaps we have been experimenting with the document and want to discard all changes before we accidentally overwrite the good version.
Closing a File (document) without saving changes is a one-liner, as shown below.
For extra utility you may want to assign an unused shortcut key combination to this macro.