unrepeated
Not done again
Unrepeated describes something that occurred once and was not done again: The experiment remained unrepeated for decades.
It often emphasizes singularity or uniqueness—an unrepeated success, an unrepeated mistake.
The word can suggest either that something couldn't be replicated or simply wasn't.
Only one exists
- one-timeOccurring only once
- nonrecurringOccurring only once
- onceAt one time
- singularOne in number
sole · solitary · individual · standalone · isolated · discrete · single · one-off
Having no equivalent
- unmatchedHaving no equal
- unrivaledHaving no equal
- unequaledHaving no equivalent
- incomparableWithout equal or rival
matchless · peerless · unprecedented · exceptional · rare · uncommon · distinctive · irreplaceable
Passing very quickly
- momentaryLasting very briefly
- transientTemporary, soon departing
- passingMoving by or temporary
- briefShort in duration
temporary · irretrievable · gone · past · bygone · vanished · lost
New and unusual
- freshNewly made, not stale
- newRecently created or begun
- firstPosition number one
- maidenUnmarried young woman
inaugural · pioneering · groundbreaking · innovative · inventive · creative · untried · unexplored
unique
Only one exists
- one-timeOccurring only once
- nonrecurringOccurring only once
- onceAt one time
singular · sole · solitary · individual · standalone · isolated · discrete · single · one-off · lone
unparalleled
Having no equivalent
incomparable · matchless · peerless · unprecedented · exceptional · rare · uncommon · distinctive · irreplaceable · inimitable
fleeting
Passing very quickly
brief · temporary · irretrievable · gone · past · bygone · vanished · lost
novel
New and unusual
maiden · inaugural · pioneering · groundbreaking · innovative · inventive · creative · untried · unexplored · unfamiliar
unrepeatedrepeated
Done or said again
recurring · repetitive · recurrent · reiterated · cyclical