infrequency
Happening seldom observed
Infrequency is the quality of happening rarely or at long intervals.
The word appears most often in technical or formal contexts: The infrequency of his visits worried her.
It's the noun form of infrequent, though *rareness* or *rarity* often serves the same purpose in everyday speech.
Seldom occurring or found
- rareSeldom found or seen
- unusualNot often encountered
- scarceIn short supply
- sparseThinly scattered or distributed
limited · few · scant · meager · occasional · isolated · seldom · paucity
Occurring at irregular intervals
- sporadicOccurring irregularly, infrequently
- irregularDeviating from normal patterns
- episodicOccurring in distinct segments
- erraticLacking regularity or consistency
fitful · patchy · discontinuous · scattered · uneven · spotty · haphazard · random
Deviation from the norm
- outlierDistant data point
- anomalyDeparture from the expected
- deviationDeparture from expected path
- odditySomething unusual or unexpected
quirk · exception · singularity · peculiarity · abnormality · irregularity · atypical · aberrant
uncommon
Seldom occurring or found
sparse · limited · few · scant · meager · occasional · isolated · seldom · paucity · scarcity
intermittent
Occurring at irregular intervals
- sporadicOccurring irregularly, infrequently
- irregularDeviating from normal patterns
- episodicOccurring in distinct segments
erratic · fitful · patchy · discontinuous · scattered · uneven · spotty · haphazard · random · desultory
aberration
Deviation from the norm
oddity · quirk · exception · singularity · peculiarity · abnormality · irregularity · atypical · aberrant · unusual
infrequencyfrequency
Rate of recurrence
regularity · high frequency · constancy · recurrence · repetition
infrequencycommonness
Frequency of occurrence
abundance · prevalence · ubiquity · pervasiveness · profusion