1. not publicly announced or promoted through advertising

Examples

• The store offered unadvertised discounts to regular customers.
• Many job openings remain unadvertised and are filled through networking.
• The restaurant’s unadvertised daily specials were written on a small chalkboard.
• She discovered an unadvertised feature in the software by accident.
• The company’s unadvertised policy allowed flexible work hours.
• Local residents knew about the unadvertised hiking trail.
• The sale included several unadvertised items at reduced prices.