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1. (adj.) unheard-of
unprecedented:
an unheard-of scientific advance.
2. unheard-of
outrageous:
unheard-of extravagance.
3. unheard-of
not previously known:
the debut of an unheard-of singer.
Etymology: (1585–95)
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| Definition of 'unheard-of' |
Princeton's WordNet |
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1. (adj) unheard-of
previously unknown
"a first novel by an unheard of writer"; "developments on an unheard-of scale"
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1. (adjective) unheard-of
not at all common or known about
a disease that is now practically unheard-of
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| Definition of 'unheard-of' |
Webster Dictionary |
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1. (adj) unheard-of
new; unprecedented; unparalleled
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Definitions of unheard-of 
