adjective
not previously announced, expected, or recognized; unacknowledged or ignored
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The unheralded scientist made a groundbreaking discovery that changed the field of medicine.
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The unheralded rookie surprised everyone by scoring the winning goal in the championship game.
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The unheralded singer blew everyone away with her amazing performance at the talent show.
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The unheralded artist's masterpiece went unnoticed until years later when it was finally recognized for its brilliance.