- previously unknown: an unheard-of actress
- without precedent: an unheard-of treatment
- highly offensive: unheard-of behaviour
单词 | unheard-of |
释义 | WordReference Random House Learner's Dictionary of American English © 2024 unˈheard-ˌof, adj. WordReference Random House Unabridged Dictionary of American English © 2024
un•heard-of (un hûrd′uv′, -ov′, -əv),USA pronunciation adj.
Collins Concise English Dictionary © HarperCollins Publishers:: unheard-of adj
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