1. not imagined or thought of as possible; beyond what was expected or conceived
Usage: often used with ‘of’

Examples

• The success of the small startup reached undreamt heights.
• She achieved undreamt-of fame after her first novel.
• The discovery opened up undreamt possibilities for medical treatment.
• His wealth grew to undreamt proportions.
• The technology offered undreamt-of opportunities for communication.
• The team’s victory was an undreamt triumph.