Synonyms to almost unheard-of

infrequent, cheeseparing, chinchy, chintzy, exiguous, meager, miserly, niggardly, piddling, poor, rare, scant, scanty, scarce, scattered, scrimping, scrimpy, seldom met with, seldom seen, skimping, skimpy, slim, slow, sparse, spotty, sprinkled, stingy, thin, tight, uncommon, unfrequent, unique, unusual, a cut above, above, admirable, adulterated, ahead, airy, another, ascendant, at a premium, attenuate, attenuated, atypical, beguiling, better, bewildering, boyish, breakaway, capping, celebrated, choice, chosen, collectable, conspicuous, crude, cut, dainty, delicate, diaphanous, dilute, diluted, distinguished, eclipsing, elegant, else, eminent, enigmatic, esteemed, estimable, ethereal, exceeding, excellent, excelling, exceptional, exquisite, extraordinary, fabulous, fallen, fantastic, fascinating, few, fine, fine-drawn, finer, finespun, first-class, first-rate, flimsy, frail, gaseous, gauzy, girlish, good, gossamer, gracile, greater, higher, in ascendancy, in short supply, in the ascendant, incomparable, incomprehensible, inconceivabl