changeful

Never staying same

Changeful means prone to change or full of changes—variable, inconstant.

The word is literary and somewhat archaic: the changeful moods of the sea, a changeful spring sky.

It emphasizes the quality of undergoing frequent or unpredictable shifts rather than remaining stable.

erratic

capricious

Subject to sudden changes

volatile · whimsical · temperamental · inconstant · moody · flighty · skittish · restless · wayward · impulsive

unstable

irregular

Deviating from normal patterns

sporadic · erratic · inconsistent · unreliable · undependable · vacillating · wavering · oscillating · turbulent · unsteady

variable

mutable

Able to be changed

adaptable · flexible · adjustable · transformable · convertible · malleable · pliable · elastic · shifting · transitional

dynamic

kinetic

Relating to motion

animated · lively · spirited · bustling · effervescent · vivacious · restless · stirring · moving · evolving

Opposites
variability/stability

changefulunchanging

Not varying at all

constant · stable · changeless · immutable · invariable

predictability

changefulpredictable

Able to be foreseen

reliable · dependable · consistent · trustworthy · certain

Family

change, exchange, changed, changing, changes, changeable, unchanged, unchanging, changer

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