changeable

Definitions

Capable of being altered or modified.

Liable to fluctuate or shift frequently, especially in mood or weather.

Examples

The weather in the mountains is notoriously changeable, so be sure to pack a waterproof jacket.

Her mood was as changeable as the wind, making it difficult to predict how she would react to the news.

Synonyms

fickle variable unstable fluctuating mercurial volatile mutable

Antonyms

constant stable unchanging fixed steadfast immutable consistent