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unheard of
Extremely uncommon or unusual; beyond belief. Hyphenated if used as a modifier before a noun. His prowess on the balance beam is unheard of. Investors began making unheard-of amounts of money on these risky investments.
See also: of
Farlex Dictionary of Idioms. © 2024 Farlex, Inc, all rights reserved.
unheard of
Very unusual, extraordinary, as in It's unheard of to have all one's money refunded two years after the purchase. This expression alludes to a circumstance so unusual that it has never been heard of. [Late 1500s]
See also: of
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.