unheard-of

adj.

1. Not previously known; unknown.
2. Without precedent; unparalleled.
3. Highly offensive; outrageous or brazen.

adjective

Not known or not widely known by name: nameless, obscure, unknown. See knowledge/ignorance.

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]

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adj

Definition: unique, obscure
Antonyms: familiar, normal, usual

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Dansk (Danish)
adj. - ukendt, aldrig hørt om, uhørt, eksempelløs

Nederlands (Dutch)
ongehoord, onbekend, nog nooit vertoond

Français (French)
adj. - inouï, record, inconnu

Deutsch (German)
adj. - unerhört, beispiellos

Ελληνική (Greek)
adj. - ανήκουστος, πρωτάκουστος

Italiano (Italian)
inaudito

Português (Portuguese)
adj. - inaudito, desconhecido

Русский (Russian)
неслыханный, неизвестный

Español (Spanish)
adj. - sin precedentes, insólito, inaudito, desconocido

Svenska (Swedish)
adj. - okänd, oerhörd, utan motstycke

中文（简体）(Chinese (Simplified))
无前例的, 空前的, 前所未闻的

中文（繁體）(Chinese (Traditional))
adj. - 無前例的, 空前的, 前所未聞的

한국어 (Korean)
adj. - 전례가 없는, 처음 듣는, 금시 초문의

日本語 (Japanese)
adj. - 前代未聞の, 奇異な

العربيه (Arabic)
‏(صفه) لا مثيل له, لم يسمع به قط‏

עברית (Hebrew)
adj. - ‮שלא נשמע כמוהו, ללא תקדים‬

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