adjective not known or experienced before; unprecedented
The designer's latest collection introduced unheard of styles and trends to the industry.
The stock market experienced an unheard of surge in trading volume.
The new smartphone features unheard of processing power and battery life.
The athlete's performance broke records and achieved unheard of levels of success.
The company's marketing campaign was so successful that it generated unheard of levels of brand awareness.
In the world of literature, it is not uncommon for writers to come up with unheard of plot twists and character developments to keep readers engaged.
The psychologist was baffled by the patient's behavior, as it was completely unheard of in their years of practice.
The scientist made a groundbreaking discovery that was previously unheard of in the field of physics.
The entrepreneur's innovative business model was unheard of in the industry, leading to rapid success and growth.
The historian uncovered a previously unheard of document that shed new light on a historical event.