unheard-of
Never before witnessed
Unheard-of describes something so unusual or unprecedented that no one has encountered it before.
An unheard-of price is shockingly high or low.
An unheard-of achievement has never been accomplished.
The phrase often carries a tone of surprise or outrage: It was unheard-of for a rookie to start in the championship game.
Introducing radical new ideas
- pioneeringFirst to explore territory
- historicOf lasting significance
- revolutionarySeeking fundamental systemic change
- unexampledHaving no precedent
pathbreaking · game-changing · landmark · watershed · epoch-making · breakthrough · trailblazing · seminal
Extremely surprising or impressive
- flabbergastingShocking into speechlessness
- stupefyingCausing mental paralysis
- mind-blowingOverwhelmingly impressive or shocking
- dumbfoundingRendering someone speechless
startling · astounding · staggering · outrageous · scandalous · sensational · appalling · incredible
Not yet discovered
- undiscoveredNot yet found
- unfamiliarNot previously known
- unrecognizedNot identified or acknowledged
- namelessWithout any designation
anonymous · overlooked · unsung · forgotten · hidden · underground · under-the-radar · little-known
Seldom occurring or found
- unusualNot often encountered
- exceptionalNotably above the norm
- extraordinaryBeyond what's typical
- infrequentHappening only occasionally
scarce · once-in-a-lifetime · atypical · anomalous · freakish · singular · peculiar · exotic
groundbreaking
Introducing radical new ideas
- pioneeringFirst to explore territory
- historicOf lasting significance
- revolutionarySeeking fundamental systemic change
unexampled · pathbreaking · game-changing · landmark · watershed · epoch-making · breakthrough · trailblazing · seminal · transformative
jaw-dropping
Extremely surprising or impressive
- flabbergastingShocking into speechlessness
- stupefyingCausing mental paralysis
- mind-blowingOverwhelmingly impressive or shocking
dumbfounding · startling · astounding · staggering · outrageous · scandalous · sensational · appalling · incredible · unbelievable
unknown
Not yet discovered
- undiscoveredNot yet found
- unfamiliarNot previously known
- unrecognizedNot identified or acknowledged
nameless · anonymous · overlooked · unsung · forgotten · hidden · underground · under-the-radar · little-known · unnoticed
uncommon
Seldom occurring or found
- unusualNot often encountered
- exceptionalNotably above the norm
- extraordinaryBeyond what's typical
infrequent · scarce · once-in-a-lifetime · atypical · anomalous · freakish · singular · peculiar · exotic · unique
- overlookedoverlooked, unnoticed, ignored, forgotten, neglected
unheard-ofwell-known
Familiar to many
famous · familiar · renowned · known · celebrated
unheard-ofestablished
Formally set up
traditional · conventional · time-honored · tried · tried-and-true
hear, hearing, harden, heard, overheard, unheard, misheard, unheard of