**(unless: // [[harlowe:Boolean|boolean]]//) -> //[[harlowe:Changer|changer]]//**

This [[Harlowe]] macro is the negated form of [[harlowe:if|(if:)]]: it accepts only [[harlowe:boolean|booleans]], and returns
a [[harlowe:command|command]] that can be attached hooks to hide them "if" the value was true.

For more information, see the documentation of [[harlowe:if|(if:)]].