occasionalness

State of sometimes

The quality of happening only sometimes or at irregular intervals.

Occasionalness implies infrequency without complete absence—something that occurs, just not often or predictably: The occasionalness of his visits made them feel special.

A rare and somewhat awkward noun; occasional or occasionally usually serves better.

infrequency

rare

Seldom found or seen

infrequent · few · sparse · limited · minimal · unusual · sporadic · scarcity · rarity · paucity

irregularity

unpredictable

Cannot be anticipated

haphazard · uneven · patchy · desultory · variable · fluctuating · unsystematic · unmethodical · unplanned · casual

intermittence

periodic

Occurring at intervals

on-and-off · alternating · interrupted · discontinuous · episodic · fitful · spasmodic · breaks · gaps · intervals

temporariness

ephemeral

Lasting very briefly

brief · temporary · passing · short-lived · transient · impermanent · provisional · tentative · evanescent · sometime

Opposites
frequency/regularity

occasionalnessconstancy

Unchanging faithfulness over time

regularity · frequency · continuousness · constantness · persistency

predictability

occasionalnessregularity

Consistent, predictable occurrence

predictability · reliability · periodicity · dependability

Family

occasion, occasional, occasionally, occasions, occasioned, occasioning

Familiarity
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Used worldwide · Timeless · Abstract · Everyday, not technical · Rated G