Here's why:
* Haughty implies a sense of superiority, arrogance, and disdain for others.
* Regal describes something or someone possessing the qualities of a king or queen, including dignity, grandeur, and authority.
The other options are not synonymous with haughty:
* Poor means lacking money or resources.
* Wistful means having a longing or yearning for something.
* Stingy means unwilling to spend money.
* Humble means modest and unassuming.