Definitions for unheard-of
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Random House Webster's College Dictionary
unheard′-of`(adj.)
unprecedented:
an unheard-of scientific advance.
Category: Common Vocabulary
outrageous:
unheard-of extravagance.
Category: Common Vocabulary
not previously known:
the debut of an unheard-of singer.
Origin of unheard-of:
1585–95
Princeton's WordNet
unheard-of(adj)
previously unknown
"a first novel by an unheard of writer"; "developments on an unheard-of scale"
Kernerman English Learner's Dictionary
unheard-of(adjective)ʌnˈhɛl θi
not at all common or known about
a disease that is now practically unheard-of
Wiktionary
unheard-of(Adjective)
Previously unknown; unprecedented
Webster Dictionary
Unheard-of(adj)
new; unprecedented; unparalleled
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