changeably

In fluctuating fashion

In a changeable manner—subject to variation or inconsistency.

The word appears rarely, usually in contexts where something shifts unpredictably: The light flickered changeably through the clouds.

More often, speakers reach for related forms like changeably's root adjective changeable or the adverb interchangeably.

variability

variably

In differing amounts

erratically · unpredictably · waveringly · unsteadily · irregularly · sporadically · fitfully · mercurially · capriciously · whimsically

adaptability

adaptably

With capacity to adjust

pliably · fluidly · dynamically · responsively

interchangeability

alternately

Taking turns successively

transitionally

Opposites
stability/constancy

changeablyunchangeably

In unalterable manner

changelessly · constantly · invariably · steadily · fixedly

predictability/reliability

changeablyreliably

In dependable manner

dependably · predictably · certainly · consistently · regularly

Family

changeable, unchangeable, interchangeable, exchangeable, unchangeably, changeability, interchangeably, interchangeability, exchangeably

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