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]
An unheard idiom dictionary is a great resource for writers, students, and anyone looking to expand their vocabulary. It contains a list of words with similar meanings with unheard, allowing users to choose the best word for their specific context.
Dictionnaire de mots similaires, Différentes expressions, Synonymes, Idiomes pour Idiome unheard