unheard of Definition

extraordinary, incredible, new, novel, outrageous, scandalous, shocking, unheard-of, unknown, unprecedented, unpublished, unreported, amazing, exotic, strangers, surd, wonderful, rare, unusual, lipread, prejudge, audible, awakenings, barren, boons, busses, com, commotions, confidences, curator, depart, devoid, devotions, dialogues, dignities, eclat, ex, flourishing, guttural, hoarse, impossible, inaudible, inconceivable, independent, loud, louder, loudest, melodious, muffled, murmured, muted, non-existent, none, nonexistent, plaintive, quavering, raspy, shrill, soundless, staccato, unaware, unbelievable, uncommon, undescribed, unfamiliar, unhearable, unnoticed, unparalleled, unuttered, whispered, wordless,