unanticipated
Not seen coming
Unanticipated describes something not expected or foreseen: unanticipated consequences, unanticipated costs.
The word often appears in formal or analytical contexts—business reports, policy discussions, scientific findings.
An unanticipated outcome isn't necessarily bad, just one that wasn't predicted: The merger brought unanticipated benefits.
Not anticipated beforehand
- unforeseenNot predicted or expected
- startlingCausing sudden surprise
- shockingCausing intense surprise
- astonishingCausing great wonder
blindsiding · jolting · stunning · bewildering · disbelief · flabbergasting · dumbfounding · jaw-dropping
Serious sudden danger
- disasterSudden ruinous event
- catastropheDevastating, large-scale misfortune
- calamitySevere misfortune or disaster
- setbackReverse in progress
complication · snag · hitch · obstacle · wrench · curveball · disruption · upheaval
Impossible to anticipate
- uncertainNot firmly known
- volatileLiable to sudden change
- erraticLacking regularity or consistency
- variableProne to fluctuation
mercurial · capricious · wild-card · unknown · incalculable · chancy · unpredicted · uncharted
Arising without external cause
- unintendedNot done on purpose
- accidentalOccurring by chance
- inadvertentDone without intention
- unpremeditatedWithout advance planning
impromptu · unscheduled · unprepared · spur-of-the-moment · off-the-cuff · ad-hoc · impulsive · random
Fortunately coincidental
- fortuitousHappening by lucky chance
- luckyFavored by chance
- providentialOpportunely occurring, seemingly fated
- windfallUnanticipated lucky gain
unexpected
Not anticipated beforehand
- unforeseenNot predicted or expected
- startlingCausing sudden surprise
- shockingCausing intense surprise
astonishing · blindsiding · jolting · stunning · bewildering · disbelief · flabbergasting · dumbfounding · jaw-dropping · eye-opening
emergency
Serious sudden danger
- disasterSudden ruinous event
- catastropheDevastating, large-scale misfortune
- calamitySevere misfortune or disaster
setback · complication · snag · hitch · obstacle · wrench · curveball · disruption · upheaval · derailment
unforeseeable
Impossible to anticipate
variable · mercurial · capricious · wild-card · unknown · incalculable · chancy · unpredicted · uncharted · enigmatic
spontaneous
Arising without external cause
- unintendedNot done on purpose
- accidentalOccurring by chance
- inadvertentDone without intention
unpremeditated · impromptu · unscheduled · unprepared · spur-of-the-moment · off-the-cuff · ad-hoc · impulsive · random · incidental
serendipitous
Fortunately coincidental
- fortuitousHappening by lucky chance
- luckyFavored by chance
- providentialOpportunely occurring, seemingly fated
- sudden thingssuddenly, abruptly, unexpectedly, instantly, spontaneous
- arrival wordsarrived, landed, here, present, home
unanticipatedanticipated
Expected in advance
expected · foreseen · predicted · foreseeable · predictable
anticipate, anticipation, anticipated, anticipating, anticipatory, anticipative