What is unbold?

"Unbold" is not a proper word as bold refers to the thickness or darkness of a text, and "unbolding" would indicate removing that attribute. Instead, the correct terminology would be "making text regular" or "unbolding text." The opposite of bold text is regular or plain text, which has a standard thickness and is not emphasized or highlighted in any way. Unbolding text can be done by selecting the bolded text and removing the bold attribute either through formatting options or keyboard shortcuts.